I was thinking 59 at first. But, the model number area looked odd in the dark photo and made me think of the overstamping that made the 147A. looking at an enhanced close-up in Photoshop, it looks like the entire model and serial numbers were hidden digitally. So, I'll leave it to the experts.I do believe that's a model 39.
I thought I knew all my dad's guns but after he passed away I found this in his stuff and I have no idea where it came from how old it was or anything. I took it out and put about 100 rounds through it recently and it's the loudest damn 9mm I've ever shot. It scares people. It's very accurate though.Looks well maintained with some honest use...nice!