Rare Antique/Vintage Ostby & Barton 10K Gold & Enamel Comptometer Maths Ring
An antique/vintage 10 carat gold ring. It was made by United States jeweller Ostby & Barton who ceased operations in 1950. The ring has enamelled detail with mathematical symbols. Above is the word comptometer.
These rings were awarded to students who performed exceptionally well whilst learning the comptometer and it dates to the first half of the 20th Century. It has the maker's mark inside the band along with 10K for the gold standard.
These rings now appear very scarce with very few coming through the art markets. A wonderful gift for the mathematician in your life.
Ring size : P (US size 7.5). Band Width: 2.23mm to 2.56mm. Head Size : 9.8mm x 9.5mm.
Condition : Very good for period. The letters C & R of comptometer are rubbed making them hard to see. Otherwise just minor wear and the enamel on the symbols in good order. Cleaned, polished and ready to wear or gift.
If for any reason you are unhappy with your item please let us know as soon as possible, and we will do our best to put things right. This item is in the category "Jewellery & Watches\Fine Jewellery\Rings". The seller is "blue_cherry_antiques" and is located in this country: GB. This item can be shipped worldwide.
- Shape: Shield
- Country of Origin: United States
- Colour: Gold
- Country/Region of Manufacture: United States
- Base Metal: Yellow Gold
- Material: Enamel
- Type: Ring
- Vintage: Yes
- Metal Purity: 10ct
- Main Stone: No Stone
- Metal: Yellow Gold
- Brand: Ostby & Barton
- Ring Size: P
- Era: Retro (1935-1950)