Trying to date my my Grand Jubile frame.

The decal is rubbed off, so i don't know if it's Reynolds 531 or Vitus 172.

The seat post is definitely 26.6 mm because I tried a 26.4, 26.6 and a 26.8.

With Nervex lugs, and Campagnolo drop outs, the catologs show me that,
it has to be a '77' with Vitus or a '76' with Reynolds.

It sounds kind of trivial, but...