Swedish manufactured rolling block artillery carbine M/1864-68-85

This is a rare Swedish manufactured rolling block artillery carbine M/1864-68-85, chambered in 12.17mm (.50). Dated 1874 it has all matching numbers. Very few were ever made for the military, just under 7,000 in total. The regimental disc reads "V.T.B. B. No23", we believe that this maybe an abbreviation for the Vaxholm Supply troop Corps, weapon number 23. The initials on the barrel are the workshop markings (place of manufacture). On the inside of the foregrip, hand written is the name. The most legible part is "Ragnar Aoberg" followed by the date.