Bruce, unfortunately, that information is probably lost to time. If it weren't a .22, I might suggest that it is a police or military rack number which usually would suggest a larger caliber.
The 1-3000 stock sequence numbers (my term) that were supposedly applied to the bottom of the left stock panel show the order in which these guns were assembled.
Based on the data that I have collected over the past several years, I do not believe that these stock numbers were used after the 490 M.W. Robinson guns shipped in 1914. Their highest serial number was 208,416 and the next grouping of serial numbers that I have starts in the 220's. This group starts later in 1914 and other than a few anomalies with stocks most likely harvested from an earlier gun, I show NO stock sequence numbers after the 490 Robinson guns in the high 207 and low 208 serial range. The highest stock sequence number that I have recorded is 2582. Nothing has shown up between 2600 and 3000 so far.
The 1-3000 stock sequence numbers (my term) that were supposedly applied to the bottom of the left stock panel show the order in which these guns were assembled.
Based on the data that I have collected over the past several years, I do not believe that these stock numbers were used after the 490 M.W. Robinson guns shipped in 1914. Their highest serial number was 208,416 and the next grouping of serial numbers that I have starts in the 220's. This group starts later in 1914 and other than a few anomalies with stocks most likely harvested from an earlier gun, I show NO stock sequence numbers after the 490 Robinson guns in the high 207 and low 208 serial range. The highest stock sequence number that I have recorded is 2582. Nothing has shown up between 2600 and 3000 so far.