Vintage non-sports, that could include Hollywood/Historical/Music/Arts, etc.
Anyhow, depends on whether you want the most knowledgeable opinion or the one that tends to maximize resale value.
For the former, you could try
http://www.pass-co.com/category/Our_Experts/c8
For the latter,
http://www.psadna.com/
Richard Simon,
http://www.richardsimonsports.com handles a lot of vintage Hollywood material, but I'm personally not certain if he offers authentication services outside of sports. You could ask, I guess; he's as good as they get in the business.
There's a many other fine experts I could fully recommend, but most just stick to buying/ selling instead of authenticating send-in items.
*In regard to the frame, you'd have to remove that if you wish to have it properly examined. It's hard to get a sense of 'depth' (i.e. preprint 'ink part of picture' vs. hand-signed 'ink lying on top') with glass in the way.
