I have a 1968 or 1969 one, and I'd agree with what Peter has observed.
I'd be surprised if 1971 was a hard transition away from Nervex lugs. The PX-10 "scholars" I'm aware of have not noted that as a formal procedural change made by Peug, though I can't argue with what anyone has observed. The view seems to be that "configuration control" was a bit haphazard. Presumably some guy in the plant had the job of dumping more lugs into a bin that the frame builders used, and the frame builder put together a set from what was in his bin. If on Thursday he had Nervex, he built with Nervex. If on Tuesday he had Prugnat, ... well, I think we all follow.
It's pretty widely accepted that the S/Ns are not a sign of much of anything, but I'd be glad to add mine to the thread a little later on. It might be worth at least comparing them.
On Sun, Jun 6, 2010 at 8:41 AM, Peter Rogers <pjrogers@rogers.com> wrote:
> Dear Jack,
>
>> From the investigations that I have made and examination of a late 1960's
>>
> PX-10 frame that I have, below are the main features that I am aware of
> (assuming the frame is painted white):
>
> BB shell was painted white, with a stamped frame serial number
> The ellipse-shaped top ends of the back stays were painted black with a
> surrounding gold line.
> The seat pillar pinch-bolt lug was painted white
> The head lugs were painted black
> The fork crown was painted white, with chrome epaulettes
> The edges of the chromed forks (front that back) had gold lines where they
> meet the paint
>
> Not sure of the exact date of when the change away from the Nervex Pro lugs
> occurred, but I think that it happened in 1971.
>
> What is the serial number of your Peugeot? It is probably pretty close to
> the one on the frame that I have.
>
> I hope that this helps.
>
> All the best,
> Peter Rogers
>
> Barrie, Ontario, Canada
>
> --------------------------------------------------
> From: <Carb7008@cs.com>
> Sent: Sunday, June 06, 2010 4:13 AM
> To: <classicrendezvous@bikelist.org>
> Subject: [CR] Peugeot PX10 Info and Sour Grapes!
>
>
> Well, the summer is apparently starting to cook here in Northern
>> Cal...what
>> with Singers for a Song and all that. I'll have to be satisfied with my
>> humdrum recent 60's PX-10 acquisition. Knowing how tricky dating these
>> lovelies is, I'll report that close inspection of Prestige derailleur
>> revealed a
>> stamping (3-68) on jockey cage. This closely coincides with probable
>> build
>> date of this PX-10 w/Model 93.
>>
>> Also, I noticed that pics of 60's PX-10s (if B&W), have black-painted
>> seat-lug and BB shell while 70's are left white...just head-lugs black. I
>> wonder
>> if this change can be traced to a specific year and ditto change away from
>> Nervex Pro during 70's PX-10?
>>
>> Jack Romans
>> Sacramento, California
>> Land of $500 Singers!
>> _______________________________________________
>>
>>
> _______________________________________________
>
--
Ken Freeman
Ann Arbor, MI USA