Turned down to your measurement, now : 62.00 mm, piston pin not included rings.
DKW SB 200 1933-38
Cyl.dia STD 61.00 mm
Comp. height 46.00 + 4.6 mm.
Piston length 81.6 mm
Piston Bolt Dia. 15.00 Length 51.5 mm.
Piston rings 2.50 x 2.50 x 2.50 mm.
Mahle Cast No. 6025
LM 5879