Alright, here goes. So I picked up a frame a few weeks ago and I can't figure out what it is, which is bothering me. It looks like a Japanese frame, but I'm unsure. Brazed on cable guides and one set of bottle bosses on the downtube. Serial number is 6R4492 and is located on the seat tube a few inches above the bottom bracket on the non-drive side. I'll attach a few pics of the frame. Thanks a bunch.

MattV22