Peugeot Racing Frame - What's it worth?

There is a local Craigslist ad for a large Peugeot Racing frame. I don't really need an extra bike right now, but if y'all think it is a decent quality bicycle, I might buy it as a third bicycle.

Here is the ad:
https://boston.craigslist.org/gbs/bi...961329661.html

The owner doesn't know the size, so I welcome your thoughts on approximate size and a reasonable price.

Many thanks in advance!