Three Towers Mark

I found this tray and not sure about the hallmark but think it is Scottish. I found similar Scottish Edinburgh mark with three towers but without the initials underneath. There is also to the right of picture it looks like a partial letter or other mark. Does anyone recognize it? Is it Sterling? Thanks for any help with identification.

This is the trademark of Corbell & Co of Scottsdale, Arizona; see If it isn’t marked “sterling” then it is electroplated.


Thanks for your information, I had not come across this mark before and was curious