1. Lot SF 72 front.jpg • Description: Bulk-franked / prepaid printed matter window envelope ("Pauschalfrankiert / Affranchi à forfait") sent from ETH Zürich Mathematics Department to the Mathematical Research Institute Oberwolfach in Germany. Features a slogan cancel advertising "Rette die Aussätzigen" (Save the lepers) dated January 26, 1982. • Evaluation: This is mass-produced institutional mail utilizing a pre-paid postal license with a machine slogan cancellation. While it has interesting academic provenance, it lacks actual postage stamps or rare postmarks. 2. Lot SF 71 front.jpg • Description: Similar to Lot 72, this is an ETH Zürich institutional envelope (from the Seminar for Applied Mathematics under Swiss mathematician Peter Henrici) sent to Oberwolfach. Features a machine slogan cancel encouraging public transit use ("Energie sparen... Tram, Bahn und Bus fahren...") dated January 24, 1983. • Evaluation: Similar to Lot 72, its value lies almost entirely in its thematic interest (public transit slogans) or academic connection, rather than philatelic rarity. 3. Lot SF 79 front.jpg • Description: Another ETH Zürich institutional pre-paid cover, hand-addressed by Swiss mathematician Joseph Hersch to Oberwolfach. Features a machine slogan cancel celebrating "100 Jahre SKG Internationale Jubiläums-Hunde-Ausstellung Zürich" (International Dog Show centenary) dated May 31, 1983. • Evaluation: Slightly more desirable than Lots 71 and 72 due to the popular topical collecting theme of dogs, along with clear handwriting from a notable academic. 4. Lot SF 74 front.jpg • Description: Standard commercial/personal cover sent from Bettingen to Freiburg, Germany, franked with a single 80c blue Helvetia stamp commemorating the "1883 VSM 1983" centenary. • Evaluation: A clean, standard single-franking international rate cover from the 1980s. These are common in modern Swiss postal history boxes. 5. Lot SF 75 front.jpg • Description: Institutional envelope from the Mathematical Institute of the University of Basel sent to Oberwolfach. It is uniquely franked with an 80c definitive stamp but also carries the "Pauschalfrankiert" imprint, paired with the "Rette die Aussätzigen" cancel from January 26, 1983. • Evaluation: A slightly more unusual piece because it combines an institutional imprint with an actual adhesive stamp to fulfill the international rate. • Estimated Market Value: $2.50 – $4.50 6. Lot SF 78 front.jpg • Description: Envelope sent from La Sallaz to Germany, franked with a complete pair of the 1968 "Pro Patria" series stained-glass window stamps (10c+10c green and 50c+20c blue). • Evaluation: Pro Patria (For the Country) semi-postal issues are highly collected. While relatively common on cover, a cleanly cancelled combination of the set on an international cover raises its appeal. 7. Lot SF 77 front.jpg • Description: Registered cover sent from Romanshorn to Freiburg, Germany, franked with a 90c stamp depicting a library/archives scene and a 2.50 Fr. landscape definitive stamp. Includes a red and white registration label (No. 546). • Evaluation: Registered international mail carries a premium over standard mail because it shows premium usage of higher-value definitive stamps to cover the registration fee. 8. Lot SF 73 front.jpg • Description: Express / Registered cover sent from Magliaso to Freiburg, Germany. Brightly marked with a red "Eilsendung / Exprés - Espresso" label and a registration label (No. 438). It features a multi-colored three-stamp franking including a 50c folklore stamp, an 80c Europa train/cogwheel stamp, and a 3.50 Fr. definitive stamp. • Evaluation: A highly desirable commercial cover due to the "triple-threat" of being an Express item, a Registered item, and holding a beautiful multi-value franking to meet a heavy or fast international rate. 9. Lot SF 80 front.jpg • Description: Registered cover sent from St. Gallen to Grüsch, franked with a horizontal se-tenant pair of 30c "Prima Ascensione del Cervino 14. VII. 1865" (First Ascent of the Matterhorn) stamps featuring the iconic mountain peak, complete with the right-hand marginal serial number flap. Includes a registration label (No. 159). • Evaluation: This item appeals strongly to multiple collecting bases: Matterhorn/Mountaineering topicals, Swiss "Pro Juventute" youth fund collectors, and those who love premium marginal/plate-number pieces on active postal covers. 10. Lot SF 76 front.jpg • Description: An attractive aerogramme/airmail cover sent from Oerlikon to Tanga, Tanganyika Territory (East Africa), dated July 15, 1956. It is franked with two 1956 "Pro Patria" semi-postal stamps (30c+10c brown landscape and 40c+10c blue lake scene). • Evaluation: This is the premium item of the lot. Standard Swiss mail to Europe is incredibly common, but mid-century mail to changing African colonial territories (like Tanganyika before it merged to become Tanzania) is highly sought after by destination collectors. The use of beautiful Pro Patria semi-postals on an overseas airmail destination elevates it significantly. 1. Lot SF 81 front.jpg • Description: Official windowless cover from the Building Department of Canton Aargau (Baudepartement des Kantons Aargau), postmarked June 13, 1974. Features a red meter stamp of 0.80 Swiss Francs from Aarau (Aarg. Staatskanzlei) and a printed bulk mailing permit mark (Pauschalfrankiert). Sent to the Water and Shipping Office in Freiburg, Germany. • Evaluation: A very common commercial/official cover with standard meter franking. 2. Lot SF 85 front.jpg • Description: Official tan envelope from ETH Zürich (Seminar für Angewandte Mathematik), postmarked April 26, 1983, via Zurich Briefversand. It features a printed permit mark (Pauschalfrankiert / Affranchi à forfait) and a black machine slogan cancel advertising emergency food supplies (auch heute: Notvorrat!). Sent to the Mathematical Research Institute in Oberwolfach via Freiburg. • Evaluation: Standard academic institutional cover. Slogan cancels add minor interest but are highly common. 3. Lot SF 84 front.jpg • Description: Commercial cover addressed to Freiburg, postmarked November 23, 1976, from Zurich Hauptbahnhof. It is franked with a single 80c blue stamp commemorating the 1977 Davos Speed Skating World Championship, cancelled with a machine slogan cancel urging radio listeners to be considerate of neighbors (Radiohörer nehmt Rücksicht...). • Evaluation: Common commercial use of a single commemorative stamp with a standard machine slogan cancel. 4. Lot SF 88 front.jpg • Description: Official cover from the Mathematical Institute of the University of Basel, postmarked January 4, 1982. It features a single 80c definitive stamp depicting a historic building (Stanser Verkommnis), paired with a machine slogan cancel for leprosy charity (Rette die Aussätzigen). Sent to Oberwolfach via Freiburg. • Evaluation: Routine academic correspondence. The stamp and charity cancel are common for the early 1980s era. 5. Lot SF 83 front.jpg • Description: Souvenir cover printed for the NABA 1971 National Stamp Exhibition in Basel (NABA 1971 BASEL), complete with an embossed post horn seal. It is franked with a vertical pair of 40c purple stamps (Geneva Cathedral) postmarked September 9, 1971. Sent to Weil am Rhein, Germany. • Evaluation: Philatelic exhibition souvenir cover. While attractive, these were produced in high numbers for collectors, keeping market values low. 6. Lot SF 89 front.jpg • Description: Airmail envelope featuring the classic red and blue bordered trim, sent from the University of Bern. It is franked with a single 80c Europa 1981 stamp (featuring a folkloric stone-thrower), cancelled on January 5, 1982, in Bern. Features the same Rette die Aussätzigen charity machine slogan cancel. Sent to Oberwolfach via Freiburg. • Evaluation: Standard airmail use to a neighboring country. The Europa theme gives it a slight cross-collectible appeal. 7. Lot SF 90 front.jpg • Description: Clean, unblemished cover franked with a single Pro Juventute 1981 charity stamp ($80c + 40c$ surcharge) depicting a coat of arms/sailing vessel design (Prévérenges). Hand-cancelled with a circular date stamp in 1981 and addressed to Prof. Dr. Martin Barner in Freiburg. • Evaluation: Clean usage of a Pro Juventute semi-postal charity stamp. Collectors of modern Swiss postal history value neat, single-use hand cancels on clean covers. 8. Lot SF 86 front.jpg • Description: Registered cover (Einschreiben) sent by recognized Swiss stamp expert Alfred Burger from Liestal to Freiburg, postmarked August 6, 1970. It features a cream Liestal registration label (No. 427) and is franked with a 30c red definitive (architectural design) and a 2.00 Franc blue definitive stamp. It bears a triangular customs or delivery mark "14" on the front. • Evaluation: Registered mail always commands a premium over standard mail. The connection to a recognized philatelic figure (Bundesprüfer) adds nice provenance for a postal history enthusiast. 9. Lot SF 82 front.jpg • Description: Registered cover (Einschreiben) postmarked March 3, 1979, from Olten (Registration label No. 783). It features heavy franking: a single 2.00 Franc blue stamp alongside a strip of three 10c red stamps commemorating the Sechseläuten festival in Zurich, totaling 2.30 Francs. Sent to the District Hunting Office (Kreisjagdamt) in Freiburg, Germany. • Evaluation: Excellent commercial registry usage with a clean, multiple-stamp franking strip. Higher denomination use (2.00 Fr.) on registered international mail increases its desirability. 10. Lot SF 87 front.jpg • Description: Airmail cover sent via Express/Speed Delivery, boldly marked with a red and black Eilsendung / exprès - Espresso label. Postmarked November 3, 1969, from Zurich Hauptbahnhof to Bauersdorf, Germany. Franked with a pair of 25c green Lausanne architectural stamps and a single 80c maroon St. Gallen Cathedral stamp (Total: 1.30 Francs). • Evaluation: This is the most complex postal history piece in the lot. Dual-service covers (Airmail + Express) require specific high-rate franking combinations. The striking visual layout and the 1960s express usage make it highly attractive to postal history collectors. Look carefully at the images to form an opinion Lot SF 71-110,131-160