The outer leather is stamped with a crows foot / military arrow mark and stores REF No. 22c/ 1147. 
It is a Size 3, the ink markings are blurred, it is marked 7 ? - 7 ?. It fits me comfortable and I measure a size 56 cm. 
Condition: a clean example in very good condition, the leather is soft and supple as are the ear cups. Two very small scuffs to the leather in the crown area.
Weight: 321 g.