Hi....
It appears to be an fn slide variation gun made in the last days of WW2. These were interspersed with ac 44 fn slides, byf 44 slides, and svw marked slides... it was originally all gray phosphate, with perhaps a dual tone blue barrel... If all matching and not import marked, I would keep it for a collectible.. or, if you want it nice, have Thor restore it... some, although I've never seen one, were reported to be all blue... cant really tell from your pictures.. But, nice gun, and the factory crudeness adds to the mystique, as it was uncommon, even very late in the war, for Mauser to let such a thing pass for issue... Best to you, til...lat'r....GT
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