There are earlier versions of Pour Monsieur (before Concentree), which are labeled as "Pour Monsieur"... and the earlier incarnation appears to be "Cologne" (most likely influenced by the taxonomy of the day... men wear cologne not eau de toilette -- lol).
Yikes, stay away from that brown liquid. It may not be turned, but guaranteed some notes degradation has occurred. Not worth the risk.
Frankly, I find this fragrance to be "fragile", as I've had about 3 vintage bottles and sold them all off. Two people gave me feedback of finding "some notes diminished"... but still acceptable. I'd say shelve the risk and just stick with the later version.