You might have better luck on some German guitar forums or maybe some Jazzier forums. They might be more likely to be able to identify it better for you.

As for value, I've seen them all over the place but it seems like the originals from the 50s command a bigger price and the ones that came in the 60s or later tend to go for less. FWIW I've seen 60s Hoyer semi-hollows and hollowbodies go for anywhere between 200-600 bucks or so. It really depends on finding the right buyer and market I guess. That being said I'm not a massive expert on older German guitars like that so hopefully somebody else can chime in.
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