Matthew,
Welcome to the forum, unless the bore has been relined it would be 9mm luger. Take a common pencil, if it fits down easily, it is a 9mm, if not, then a 7.65mm.
Ed
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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