Help with I.D. Please - Gryphon and Letters in Shields

[Alizerin]

Hello all,

I have been all through the encyclopedia and have not found this mark. It looks like something that would be easy to identify, but it has me perplexed. I can't seem to find any makers who used a Gryphon (at least that's what I perceive it to be).
Perhaps one of you know who it is? I can't read the letters, I'm pretty certain that the middle one is an "S".
Thank you!

[2209patrick]

Hello.

Believe the letters are OSC.
Oxford Silversmiths Company, New York City.
In business at least from 1918 to 1950.

Pat.

[Alizerin]

Thank you, Pat! Much appreciated.

[Traintime]

Photos now lost but link to mark if it helps another search: https://www.925-1000.com/silverplate_O.html