It's virtually impossible to compare Francotte guns made before ~1960 to those made afterwards, as several ownership changes after ~1960 resulted in a very different company.
If the serial # fits the 'medium grade' designations, that's likely what you've got - a very nice early 70s 'Purdey style' sidelock w/ articulated front trigger and cocking indicators.
More pictures, including all barrel and action marks/stamps, etc., might allow for a few more conclusions. What gauge is it?
Francotte went out of business, apparently for good, ~Y2K.
MickeyD,
I suspect I've got the same catalog you do, being a European [in French] version. From ~ 1900 through the 50s Francottes were imported in the US by only a couple of companies, and the various US models are fairly easy to differentiate. The European market had a completely different set of models to choose from, as this catalog clearly shows.