I have a later model Mercier 300, it has prominent Reynolds 531 stickers on the seat tube and on the forks. (Which aren't chrome tipped and neither are the chainstays)
I thiink mine is about 1975 vintage, it has cotterless cranks, a better looking stem and tubulars.
Here is a pic of a 1972 Mercier with chrome tips
http://www.bikespecialties.com/vinta...iermaroon.html