I'm a watch collector and someone posted this over at our forum and I think I have figured out the maker but want to confirm with you as its not in the Birmingham Marker's mark list and if correct, feel free to add it.
I believe that the "DSD" markers mark is for David Stewart Dawson before he immigrated to Australia. https://en.wikipedia.org/wiki/David_Stewart_Dawson
can anyone confirm or correct this ?
thanks in advance
Michael.