Looks like "open C" on the rear QR skewer, definitely some value in the parts. I parted out a later version of the same bike several years ago.
Got a close up on the hubs?
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1971 Paramount P-13 Chrome
1973 Paramount P-15 Opaque Blue
1974 Raleigh Professional Blue Mink
1991 Waterford Paramount
Holland Titanium Dura Ace Group
Holland Titanium Ultegra Triple Group