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German Logarithmic Slide Rule - A.W. Faber Castell Electro 1/98

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

Category: 
Scientific Instruments
Condition: 
Excellent
Medium: 
Wood, metal ++
Distinguishing marks: 
A.W. Faber Castell Electro 1/98
Date Period: 
1920-1940
For Sale?: 
No

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