bn1961 Posted June 12, 2021 Share #1 Posted June 12, 2021 Does anyone know anything about this maker? It looks like a regular issue disc but is marked OROIO. I just dug this out of my mess. I had it many many years but never looked for a maker mark. I never heard of them before. Thanks in advance. Link to comment Share on other sites More sharing options...
Wake1941 Posted June 12, 2021 Share #2 Posted June 12, 2021 Makers mark is Oroid, not a super common one Link to comment Share on other sites More sharing options...
bn1961 Posted June 12, 2021 Author Share #3 Posted June 12, 2021 great. I appreciate that. Link to comment Share on other sites More sharing options...
Salvage Sailor Posted June 12, 2021 Share #4 Posted June 12, 2021 Not a makers mark, it's a method of plating items. The 'OROID' finish has been washed off of the OP's example. USMF Topic here --> 1930's H-H OROID Air Service 4 piece winged prop disc Oroid - Usual spelling is o·ro·ide An alloy of copper, zinc, and tin, used in imitation gold jewelry. Copper - approx. 81 %, tin - approx. 15 %, zinc - approx. 5 % Another USMF Topic on OROID finishes 1930's USMC AVIATOR WINGS - OROID Link to comment Share on other sites More sharing options...
bn1961 Posted June 12, 2021 Author Share #5 Posted June 12, 2021 That is very interesting. Thanks for sharing the info. Ya learn something new every day. Link to comment Share on other sites More sharing options...
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