Early 1960s is about right. I recently met the owner of a 1963 Frejus track that had the same crankset as that one: serial #106055. My 1956 track is #56290 and was not a skip tooth. I was surprised to see his with 1" pitch, but apparently some of them came through that way even as late as the mid 1960s.
You can check the lock nuts on the hubs for dating if they are Campy hubs and original to the bike.
I think I've seen that bike in a store in lower Manhattan. Is that so?
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Michael Shiffer
EuroMeccanicany.com