925 Modernist set marked 925 & "C" in hook clasp hope you can help

[cmarie71]

Hi I'm hoping you can help... (I also have another posting of an "AK" mark that I'm trying to figure out, so if you could check that one out, it shouldn't be too far from this post as I just posted it 10 minutes ago.... Thx)
This set is only marked within the clasp and the bracelet clasp only has 925 marked inside the hook clasp.
The necklace is the one that has what appears to be a C or a partial omega symbol, I don't know... The 925 is in the crook of the hook so I couldn't get it in the pic, sorry, the pic of the inside of the hook was the best I could get, but that's literally all that's there, the ”C” & 925... Thanks for any comments or insight! Also if anyone has any idea what this style would be called or
Please see attached pics...