I recently acquired a k11 carbine, I have noticed it is all matching serial number except for rear sight
I've checked with my friend's rifles, it seems all rifles and carbine before k31 have their rear sights marked different serial number, otherwise all matching. K31's rear sight is unmarked...
I have found following rifle in this link for serial number registration: "swisswaffen.com/?F=ASN&LP=TRD"
in Modell 1911 Infantry Rifle section:
P.10066 Meldung per Email, Waffenhändler auf der Systemhülse "C. Daubenmeier Dietikon", Lauf weissfertig
I think there are a lot...