Hi,
FBM probably stands for 'Freiwilliger Beschuss' and 'Vorbeschuss' and means that this gun needed no proofing according to German laws (as it was an export piece), but that it was offered for testfiring voluntarily by Mauser.
These marks can also be found separately in the following forms:
Eagle/FB (Freiwilliger Beschuss -- Voluntary testfiring)
Eagle/M (Vorbeschuss -- Tested before finishing)
Guns destined for the German/European market had the German Eagle/N (Nitro Beschuss -- Nitro proof) mark.
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