So, did he make a lot of other calibers also?
Yes, he made up Lugers in about any caliber that could be made to fit in the action but also the originals, 7.65 and 9mm.
The ad you link is to a Navy, still in 9mm. The question is, was it a Navy when he started with it? Maybe he just restored a worn Navy and added the Martz Safe Toggle Release (MSTR on the left rail.) or maybe he assembled one out of parts, having found a rear toggle with adjustable sight. Handsome piece, either way.