As the gun still shows the crowned, double-head eagle of Austria -Hungary with the "1" on the breastplate, it was first proofed in Ferlach before 1919, not in 1925. The ledger number 4454.25 appears to have been altered in the last 3 digits. There are two different Bohemian lions. That on the right barrel comes from 1919 to 1930, possibly Weipert because it looks like a "2" to me. The other, fainter one on the left barrel, together with the "N in shield", is in use since 1931.