Is it just me, or is this a surviving example of the 77mm KiH (Kanone in Haubitzenlafette)!!! Look at the sights of the gun, they are identical to the 77mm FK 96 n/A, whereas the carriage is undoubtebly of the 105mm lFH 98/09-type...
Sorry, my mistake. On closer inspection the carriage looks more similar to the 96 n/A (fi, the brakes are on the backside of the wheels). Probably an export version of this gun...