F Model Felt & Tarrant Comptometer

Photos Submitted for Appraisal

🔍 Click to enlarge and inspect marks, signatures, and condition detailsTap to zoom and inspect details

S

Posted by scottgittens

14 years ago

AI Appraisal

💬 Share Your Insight 🗣️ Discuss with Community

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.

eBay Auction Link

Price Paid (If known) $10

Log in or register to post comments

💎 Have another item? Upload photos for a free appraisal →

Collectors with this item

Want to appraise yours? Upload photos for a free appraisal →

⚠️ You have 1 free appraisal left today Upgrade for 15-30/day →

Want more from your appraisals?

Upgrade for PDF reports, more daily appraisals, and ad-free experience.

← Whitney vintage14k/diamonds ladies Bulova watch →

Have another item you're curious about?

Collectors often evaluate multiple items from the same collection, estate, or find.

Appraise Another Item Quick Scan

Explore More Collector Guides

Price Records Collector Questions Value Guides

⚠️ Legal Disclaimer

This appraisal is provided for informational and educational purposes only and does not constitute a certified, licensed, or formal appraisal.

Appraisal results are generated using automated systems, including artificial intelligence, and are based solely on the information and images submitted by the user, along with publicly available data. As such, results may contain inaccuracies, omissions, or errors.

InstAppraisal does not authenticate items. No determination of authenticity, origin, materials, maker, or age should be considered verified. Many items—particularly luxury goods, watches, jewelry, coins, art, and designer products—are frequently counterfeited and may closely resemble genuine examples. Authenticity cannot be confirmed from images alone.

Any statements regarding authenticity are expressions of opinion only and should not be relied upon as fact. Independent professional authentication is strongly recommended before any purchase, sale, or valuation decision.

Appraisal values are estimates only and may vary significantly based on condition, provenance, market demand, and additional information not available at the time of review.

Appraisals must not be relied upon for insurance, legal, tax, estate, or financial purposes without independent professional verification.

InstAppraisal disclaims all liability for any losses, damages, or disputes arising from reliance on this appraisal, including transactions conducted based on the information provided.

By using this service, you acknowledge and agree that you assume all risk associated with reliance on appraisal results.

📸 Quick Scan