Originally Posted by Hummer

I have never seen a Gitane Traveller before.

The serial number looks like 3463 485 ( or 405).

The first four characters are a date code:

3 - day of the week
46 - week of the year, which translates to month November.
3 - year of manufacture, 1973.

This is a typical Gitane serial number for the year 1973.