Hi,
A very nice discovery. I shouldn't worry too much about the quality and danger of the ammunition. It can usually be stored for quite a long time without it becoming dangerous.
Your pistol may either be in 7.65 parabellum or 9mm parabellum. The bullets could answer the question. If the case has a small neck, it's 7.65. If it's a straight case, it's 9mm. The ammo itself may have some value, depending on the maker.
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