In the early to mid 1950s, there were quite a few hobby shops or small manufacturing shops, often manned by ex-broadcast employees who used readily available components, like the M7 Neumann capsule or Siemens polystyrene capacitors, as shown on the pictures. Only a few of these shops made it mid- or long term (Schoeps comes to mind; though, as David Satz mentions below, that company did not use Neumann capsules) while others- Mayhak, Hiller, Henry, etc. floundered.
The unit itself looks lovingly homemade, but don't forget that "homemade" quality in a country which prides itself of a sophisticated guild apprentice system for craftsmen may often supercede today's U.S. boutique mic standards when it comes to fit and finish.
It would have been nice to see the heart of the mic- the tube system- that I assume powers this thing.
P.S.: For future viewing, once eBay removes the pictures, please copy one or two pictures and insert them into your post.