It looks a lot like the Studio Projects B1
I just had a look at my Studio Projects B1 and it appears to be a very similar or identical circuit, same components, too.
Componentwise there's nothing to complain. Actually it's quite surprising to see WIMA caps in such an inexpensive mic. I don't think anybody has traced that circuit so far. It is probably a pretty clean and linear circuit. The backside PCB appears to be a DC converter for the capsule polarization.
I suppose the overall character is in the capsule, which, since it is a K87/K103 knock-off, has a substantial treble boost. In the U87 this treble boost is compensated by a filter circuit. But that's of course not all that separates the B1 from a Neumann. The TLM103 doesn't use a filter circuit either, still it sounds much better than a B1. It simply has a better capsule.