The PX10 frameset for sale on ebay Holland is a great example of mid 60's frameset. My best guess is that is a '64 or '65. From what we've been able to determine 63's had script 'Peugeot' lettering with block lettering being a '64 feature. We also know that WC rainbow stripes were avaialbe on '66 models at the latest (possibly sooner).
The frameset in question has 3 rows of checkerboard decals, NO WC stripes, a blue Inoxydable decals and NERVEX decals which is feature that not seen on late 60's models.
Jim Ruggieri