Years ago I lettered a 5" .44DA that had # to the gun checkered walnut grips. In the letter Mr. Jinks said there was no mention of the grips and they were probably added at their dealer as they kept them in stock.
This might be why yours are not #'d, as they could have been replaced.
So twenty years later I decided to sell the .44DA and looked at the die stamped #'s again, compared them to other No.3's and they matched. I asked Mr. Jinks on this forum whether their dealers could # the grips or if only that was done at the factory. His answer was No the dealers couldn't, only the Factory stamped #'s on grips. Alas their factory just like Jim's ad in the Old Town Dispatch stated. It's just so Cool being a 5" I decided to keep it. Can't figure out how to upload pic's?