Gem model P???

[GEM GUY]

Hi, I picked up what I think is a GEM model p at an estate sale. It's in ok but not great shape. I was told that it works but need to borrow an amp to test. No plate with model or serial numbers. "Made in Italy" on plate on underside. Holes where I believe GEM name plate may have been. One difference I've noticed from any pics online is the back plate with base and output side to side rathe than over/under. Looking at back right to left its power, output, fuse, base. Came with older more rounded stand legs with cross stretchers in back.

Any idea where I should be looking to estimate vintage on this combo? No way to attach pics here?

Thanks!