Yes, I would agree that your frame is Reynolds. It's been a long time, but my eye caught the crimping on the chainstay. I would guess that your chainstays are actually Reynolds track blades. We often did this substitution because they were a gauge heavier and added significant stiffness to a frame and very little weight. Whereas the regular chainstays were shaped at the Reynolds factory for chainwheel clearance, we had to custom crimp the fork blades for clearance.