Hi, my name is*****'m a certified appraiser, and I'd be happy to help.
Can you please provide a clear, tight close-up of the marking?
Also, is there anything under the base?
The photo will only zoom to a small extent. I'll try to see what I can find--it's not clear enough to do an image search which is the best resource. I'll get back to you on it.
I'm not sure why no one picked up the other clock, I'll mark that one and work on that as well.
Hopefully I should have answers for both by this afternoon if not sooner.
Are you absolutely positive the letters are a D and an A? Because the photo will not zoom--too distant. Can you take a picture with the phone or camera much closer so I can zoom better? D and A with an anchor brings no matches, but sometimes I can discern that it's a different letter by examining it under zoom.