It's very nice to see your carbine shown here. It has very nice colours and the blue on the barrel and tube are very good too. You'll see that the comb flute was removed in your model which is a second variation with a B prefix serial number. The butt plate is also a little different shape. Notably there is the increased wood in the forestock. This is the same in the sporting carbine and rifle iterations of the second variation. Now you need to look for one in a first variation to match it. Both variations are scarce whether in carbine, sporting carbine or rifle. I think the rifle iterations in both variations were the scarcest.