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F Model Felt & Tarrant Comptometer

S
14 years ago
AI Appraisal
Description

 This item is in great condition.  The top flat surface has 5 water-droplet sized spots of copper discoloration (green tint) as well as a thumb-size green discoloration near the serial number.  The serial reads F60725.  The sides have decorative markings on them, but the front and back have no markings.  The lever on the right functions as a reset.  The red key moves up and down, but I can't figure out how or if it works (the oldest calculator I ever used was made 80 years after this beast.

Category Scientific Instruments
Medium A dark brown metal containing copper
Distinguishing marks Parallelogram Comptometer Tab with Patent Dates
Condition Excellent
Size and dimensions of this item 14"x8"x3 3/4"
Date Period 1915-1920
Weight 20 lbs.?
History Found it at a garage sale in Hillsboro, OR. I've done some research to determine its model and thus the date of production.
Price Paid (If known) $10
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