Not sure what you are looking for. No one can give you a a date of manufacture, only a shipping date which you seem to already have narrowed down pretty well. They did not ship in serial number order with sometimes large gaps. The victories probably shipped as close to serial number order as any model has, but it is still not a given. A letter will get you a ship date and where it was sent,although for the commonwealth guns it may be the British Purchasing Commision and parts unknown from there. The acceptance marks tell you more. For example, the broad arrow DD would be Australia, but you said you already knew that.

If you are asking if the guns have been bored out, no one but you can ascertain that. Try chambering a 38 special round. If it fits and the barrel says 38 S&W, it's been bored out. This was often done by the importers and there are no records. You find some done well and some not so well. It is nice to find one unbored inbreeding so many were butchered.