MOD. 91 SERIAL CHARTS

* Probably spare barrel serialised in a second time. Spare barrels received the serial of the og barrel they were going to replace, so they basically took over the receiver serial.

WW1 Production for Terni was: - NN-ZZ (skipping Torino's OO-OZ, EE-EM and Torre Annunziata's UR-VV), then covered the missing single digits of the 1892-94 production (basically P-V), then covered the missing serials of the 1895-1915 production (BD-ED, UE-UM, etc.) then started the 1A-1Z series.

Extra note: 1908-1911 production is basically halted, most barrels produced in this span got serialised altogether, probably at the beginning of the Italo-turkish war in Libya.
That's why it's normal to have many discrepancies, like a 1910 barrel with LL prefix.