What caliber was the Borchardt?

Got into a discussion with a couple guys at work this morning. I've got to find out what caliber(s) the Borchardt pistol was chambered in and when it was introduced.

Also, when was the .30 Mauser round for the Broomhandle Mauser pistol introduced?


I figured this forum would be the place to ask this sort of question.

Thanks,

Jason