Is there a site or resource that someone can recomend to help identify a headstock logo? I recently did a Matsumoku rebuild and all it needs is a headstock logo, but I don't know what I'm looking for. I've been told it could be a Conrad or Lyle, but have no way of confirming it. The best clue so far is a faint mark in the headstock finish that can't be seen when looking at the guitar, but does show up in a picture. It looks vaguely thunderbird shaped with two closely-set mounting holes.
I appreciate any advice you can offer.