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Its old - mid 1990's. My first though was a home modified hardtail to make a Full sus, but its more likely either very early prototype Full Sus or what we call BSO. What country is it from? Whats is the problem you want to solve.
It at least isn't a generic frame, but has several unusual features. "Carhartt" is a clothing brand, but they apparently license the name to Pelago and possibly some other bike manufacturers. Googling carhartt bike brings up a lot of bike images, but nothing resembling your picture.
I posit that the carharrtt sticker is nothing more than a sticker and is nothing to do with the bike. @DanielRHicks it looks like a sticker, not a decal or transfer.
It’s a really bad way to add rear suspension to a bike as it loses all of the lateral stability and strength of a diamond frame. Just one hard landing that’s slightly off balance will crumple the rear. Good for selling BSOs though.
Interesting - the upstand brace on the top tube is very similar. The shock mounting pictured here is under the top tube not on the downtube, but its still remarkably similar. The forks looks similar in beefiness but lack the protective boots on the stanchions. Your forks are dual crown whereas OPs are single crown. Yours has disk brakes and OPs is rim brakes. So whatever this is seems to be several years newer but in the same genetic lineage. Could be a more "downhill" version or could have had an uprated fork fitted.
carhartt bike
brings up a lot of bike images, but nothing resembling your picture.