25.2mm is a very odd size for a seatpost, but that is the ID of the seat tube on my Motobecane Grand Touring [circa 70's).

I would like to find one that size. Something vintage and French would be nice. I currently have a 25mm Simplex and one 0.2mm larger would be perfect.

Note that I don't need a long post. I have short legs and long arms so I have the largest frame I can stand over. This also means that I need a post that is round all the way up since it will only extend a few inches.

A vintage Japanese might be OK. The SR 'Custom' looks nice.