I now have this gun in hand. Further info I could only find on this maker is that he was in business around 1910-1928 where it appears he went bankrupt. He died in 1937 at 53 years of age. I questioned the seller about the screw through the wrist and he thought it appeared a factory thing. Now looking at it, it appears to me that it might be factory as there is absolutely no gap around the edges and it is perfectly flush with the stock. I compared this gun to my Webley & Scott from 1906 and this Wallas is much slimmer through the wrist, another reason that I think the wrist screw might be original. Compared to the Scott, I find this gun overall to be sleeker, better handling and the quality every bit as good if not better. It also has nicer wood, greener crossbolt and the bottom is not pierced. The bores are mint. Wished it was a straight grip though. I don't suppose there is any way to narrow the year other than the time period the 12/c within the diamond was used.