I appreciate the information. It sounds like I happened on a good find...as I bought the gun for less than $400 in 90% condition. The same shop still has on the rack a 37 Trap version, also a Knick rib model, with hand cut checkering. It's at least 90%, though with a higher serial number (can't recall how much higher). They're asking $495, but I'm guessing $400 cash would bring it home. I'm sure that a later, post-war version target gun (as I think the trap model is) would be less collectible than the pre-war skeet gun, but it sounds like I may need to go back and get the trap gun too.
Glad to learn about the Walt Snyder Ithaca 37 reference book. Knowledge is power....Thanks again.