Originally Posted by
danaconstance
The serial is F7109. June?
Your bike is the 9th frame from June 1971. My P-13 with Nervex lugs is F7128, the 28th frame made in June of 1971. Your bike definitely confirms that Prugnat lugs were used in 1971... well into 1971 in fact. It makes me wonder if the original owner may have custom ordered it that way.
Very strange, but very cool!