Hoss Cartright

Seen today at the Hoosier Bicycle show and swap in Lebanon Indiana - "Regina Sport" - I was thinking it looked early 1970s but the bottle-cage braze-ons threw me. Seemed not to be a repaint. The price was $500.00 and almost my size. Rims were tubulars, hubs Campy. Seemed to have very early Dura-ace CP brakes, but the levers were Dia-Compe, the rest looks like campy gran sport. SR stem with Randonneur bars, the seat post was an interesting 3TTT number with a pivoting allen-bolt saddle-tilt adjuster, but I forgot to take a photo of the underside of the saddle area. Dropouts were Campy but the tubing is unknown. Are those Prugnat lugs?

I have no clues about this bike. Had never even heard of Regina road bikes until today. Thought they just made drive-train components.