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https://www.globalgemology.com/o.html
OSCAR HEYMAN & BROS. Hallmark(s): "HB" Information: Born in Russia, growing up in the Fabergé workshop, Oscar and his brother, Nathan Heyman, learned invaluable techniques working in platinum and gold. Oscar Heyman & Bros. was founded in 1912 after moving to America to avoid military service. They produced top tier jewelry …
https://www.etsy.com/market/otc_jewelry
Vintage OTC Sterling Silver Pendant solid 925 silver peace sign, CND symbol, stamped 925 Thailand with matching 925 OTC chain.
https://www.answers.com/Q/What_does_it_mean_when_jewelry_is_stamped_with_OTC
If a piece of jewelry is stamped with OTC 925, the OTC stamp is the name of the company that made the jewelry, OTC International. 925 is a common stamp on all sterling silver. What does otc mean on...
https://trademarks.justia.com/owners/otc-international-ltd-271605/
ETERNITY SILVER. Filed: March 18, 1998 Sterling Silver jewelry, namely, rings, chains, pendents, pins, earrings, and bracelets Owned by: OTC INTERNATIONAL, LTD ...
https://www.invaluable.com/blog/guide-to-jewelry-marks/
Apr 06, 2020 · The study of jewelry maker’s marks is a fascinating subject, steeped in history, culture, and art. Often overlooked due to their intentionally hidden location and diminutive size, the etchings found inscribed on a piece of modern or vintage jewelry offer a window into the “who, what, and where” of the piece – and are well worth a serious look.
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