It's a generic "Made in China", no actual brand.
Should be available on eBay, AliXpress, Amazon.
I use one for closing casebacks on quartz watches and the dies from my other press can be used to supplement the range of sizes.
Thanks. Appropriate for a Speedmaster bezel?
Probably. But you need to test it out firsthand to make sure that the hollow part is open enough to completely clear the crystal.
and that the bottom part is the right size as well. With the hollow section you can accidentally apply pressure on the crown if you don't use the right size there. And yes, the stem and internals will be damaged from that kind of pressure.
If I remember correctly the 40-42mm is too big for the bezel and I used the next smaller size.
edit: nope, my memory was faulty (again) I am using the 40mm side for bezels. Just pulled it out and measured the one I use.