Early BMF mark?

[Nick_B]

Hello!

Looks like Berndorf Metalware Fabrik (BMF) mark before 1875 (two-head eagle instead of bear), but i'm not sure.
And what does mean "AM"?



Mark is on fork. If needed, I can add fork photo also.
Is it big rare?

Thank you,
Nikolay

[Nick_B]

Probably, very rare mark.
Nobody know nothing about its.

[Traintime]

Berndorf BMF marks by ASCAS: http://www.ascasonline.org/articoloFEBBRA191.html