Well, maybe not... the frame origin question is still somewhat up in the air I suppose. But yesterday I found an identical Apollo frame in near original condition at a local bike shop. The proprietor had cycled around Europe on it in the late 70s or early 80s; her version came with Dura-Ace and the model was either the Mark V or Mark VI... I'm guessing the V came with 600, the VI with DA? Also the tubing I was told is Ishiwata. Here are a couple of the terrible pics I shot with my cell phone camera, intended to show the lugwork.

The owner was very kind and showed me several other beautiful time capsule bikes the store had hanging around; my bike is now dismantled but I'll be going back when the resto starts...