[Petrusja]

Ah, yes, it does read (Alb) between the brackets, now I see. Thanks.

No, they only have one of the same photos. They say it was interned by the Dutch, and that the Dutch serial F-257 was probably allocated. Edit: F-227.

Can you teach me about Idflieg serials? They are not specific per aircraft type, but specific for the aircraft class such as 'D' for biplane fighter?

So if it reads Fok D.VII 1234/18 on the fuselage, the serial is really D.1234/18, and there could also be a C.1234/18 reconnaisssance aircraft?