Faber-Castell 111/54 "System Darmstadt" Slide Rule + Free Bonus Triangular Scale Ruler - Used, Very Good Condition Description:For sale is a magnificent vintage mathematical instrument lot centered around a premium Faber-Castell slide rule. The items are pre-owned but have been well cared for over the decades. Lot Contents & Condition:1x Faber-Castell 111/54 "System Darmstadt" Slide Rule: A premium analog calculator made in Germany (Darmstadt/Karlsruhe series). The celluloid scales are clean and perfectly readable. The clear plastic cursor is intact with only minor signs of age. It includes its original green/transparent protective hard case.1x Three-Sided Triangular Scale Ruler (FREE BONUS): Featuring multiple architectural and engineering scaling ratios, preserved in its original vintage cardboard sleeve. This item is included in the lot as a complimentary gift for the winning bidder. Shipping:Fast and secure registered shipping with a tracking number. Will be carefully packed to avoid any damage during transit.