Hewlett Packard - Calculator - 1970-1980

Piece de resistance for collectors: Complete Vintage Hewlett-Packard HP-21 Scientific Calculator (1975) – Including Original Box, Manual & Accessories – "Woodstock" Era!

Description:
Pioneering technology from the golden age of electronics! We are proud to present this iconic Hewlett-Packard HP-21 scientific pocket calculator from February 1975. This model, developed at the time under the internal codename 'Pumpkin', was the launchpad of the legendary Woodstock series. It replaced the legendary HP-35 and offered unparalleled computational power in a more compact and elegant design.
The HP-21 is remembered in the history books for its unique mechanical slider switch for degrees/radians (DEG/RAD) and the crystal-clear, ruby-red LED display. Thanks to the famed RPN input logic (Reverse Polish Notation) it was the absolute precision instrument for engineers and scientists in the 70s.
What makes this particular lot truly unique is its absolute completeness. Vintage HP models are rarely offered in this condition and with all original accessories. A dream for any serious collector of technology and retro curiosities!
Dimensions & Specifications:
• Length: 130 mm (13.0 cm)
• Width: 68 mm (6.8 cm)
• Thickness/Height: 30 mm (3.0 cm)
• Weight: 170 grams
Included in this lot:
• The HP-21 Calculator: In gorgeous aesthetic condition, with clear key legends and the iconic slider control.
• Original Box: The extremely rare cardboard packaging with the original Hewlett-Packard S.A. (Switzerland) distributor sticker. A historical document in its own right!
• Original 'Owner's Handbook': The iconic English-language manual with ring binder, fully intact and undescribed.
• Original Carrying Case: The authentic brown leather-look case with embossed HP logo.
• Original Charger/Adapter: The authentic power cable.
Condition of the object:
• Visual: In exceptionally nice vintage condition with minimal, normal signs of aging (see photos).
• Technical: As is typical with these 50-year-old Woodstock models, the internal rechargeable batteries (NiCd cells) must be replaced for operational use. The object is sold as a collector's piece in the state in which it is.

Collector’s Holy Grail: Complete Vintage Hewlett-Packard HP-21 Scientific Calculator (1975) – With Original Box, Manual & Accessories – "Woodstock" Era!
Description:
A true piece of computing history! We are thrilled to offer this iconic Hewlett-Packard HP-21 scientific pocket calculator, introduced in February 1975. Developed under the secret codename 'Pumpkin', the HP-21 marked the spectacular debut of the legendary Woodstock series, refining the technology of the pioneering HP-35 into a sleeker, lighter masterpiece.
The HP-21 is highly sought after for being the only HP model featuring a physical slider switch to toggle between Degrees and Radians (DEG/RAD), combined with a beautiful, bright ruby-red 12-digit LED display. Utilizing HP's famous RPN (Reverse Polish Notation) logic, it was the ultimate status symbol for engineers and scientists during the mid-to-late 1970s.
What sets this specific lot apart is its incredible completeness. Finding a Woodstock-era calculator with its original box, let alone the original distribution labels, is an absolute rarity on the current market. This is an investment-grade lot for any serious technology, space-age, or retro collector.
Dimensions & Specifications:
• Length: 130 mm / 5.12 inches
• Width: 68 mm / 2.68 inches
• Thickness/Height: 30 mm / 1.18 inches
• Weight: 170 grams / 6.0 oz
This complete set includes:
• The HP-21 Calculator: In beautiful aesthetic condition, keys are crisp, and the iconic slider functions smoothly.
• Original Box: The highly fragile, rare cardboard box featuring the original Hewlett-Packard S.A. (Switzerland) address sticker.
• Original Owner's Handbook: The spiral-bound manual, completely intact with no missing pages or writing inside.
• Original Carrying Case: The authentic brown leatherette zipped pouch embossed with the classic Hewlett-Packard logo.
• Original Power Supply/Adapter: The genuine charging brick.
Condition Report:
• Cosmetic: Excellent vintage condition with only minor signs of age (please inspect the high-resolution photos).
• Technical: As is typical for these 50-year-old Woodstock electronics, the internal rechargeable batteries (NiCd cells) need to be replaced for daily operational use. The item is sold as a collector's piece in its current estate condition.