German Logarithmic Slide Rule - A.W. Faber Castell Electro 1/98
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Description
I would love if someone could identify how old this ruler is, and what it's worth...
I find them at auctions going from $20-200. I believe mine is mid 1930's, made in Germany, with german writing on the back. Some of these have dates on the ruler itself, but I can't find any on mine.
More photos: https://imgur.com/gallery/CiAbbrU
Condition
Good
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