You do have a vintage racing bike, really. It's a vintage bike someone converted to racing . For whatever it's worth, they started producing bikes badged with 'Nice' (and other French city names) in the late 80's, start year for 'Nice' was either '86 or '87, I forget. Like I said, I have an '87 Nice and it's a damn nice bike. Is it a PX, PY or PV? No. But it rides lighter than it feels, and they typically shipped with fully indexed shift setups, it's very comfortable, responsive, quick.

FYI only, the reason I'm saying this is a '91 is because of the Y### under the bottom bracket. This started in the mid-80s IIRC and normally follows the format of YABB where A = the second digit of the year (6 = 86, 1 = 91 in this case I think) and BB = the month of manufacture. Depending on what original hardware is still on the bike, you could possibly confirm that by looking up the date codes on assorted pieces of hardware.

If you want to dig through catalogs for various countries, hit cyclespeugeot.com or bikeboompeugeot.com or Cycles Rétro-Peugeot and you'll find a lot - but pretty sure the catalog page I linked is your actual bike, prior to being built up to what it is now.