It does look like a Huret Rival when I compare it to the velobase images. I'd say its an exact match other than any label on mine has been worn off. I've been looking thru the different year Peugeot catalogs for the 1980's but haven't found anything that makes me think I found a match. Some looks similar but sometimes there just isn't enough to go on, at least for me, to think its a match. Not finding much as far as specs or catalogs for Gitane though. Doesn't sound like either had much of a serial numbering scheme that could be used to ID it.