I assume the logo has worn off, otherwise you wouldn't need to ask...but....
That looks EXACTLY like mine- a "Coleman Steel Belted 54" and mine is 13"x22"x16", so I think it is the same. The 54 means it's 54 quarts.
I converted mine and used it for one batch with a copper manifold. Really simple, and the only thing i had to modify from the wiki directions and parts list for that project was to cut a bit off of the inside fender washer so the new straight edge would fit against the bottom corner of the interior, because the valve is set a bit low compared to the Igloos or Rubbermaids. 30 seconds with a hacksaw, 3 minutes to yank out and replace the valve, and I was set for the manifold.
23 lbs. for a 10G batch left me with tons of headspace leftover, so it's plenty big.
BUT...it holds temps for crap. You WILL need a blanket or wrap.
I stupidly did no tests and just assumed it would be fine, but lost more than 5 degrees in short order. I ended up scrambling to decoct repeatedly just to maintain my temps, and ended up hating life on what should have been an awesome return to brewing.
Fun facts: that thing retailed for $100+ for my dad 15+ years ago, and the new retro models can almost double that. Mine was free and I already have a kick ass cooler for parties and camping, so that's why I chose to gut it, and I didn't have to spend more money on a round Rubbermaid.
Since my brew day went so poorly, I found reviews on Amazon that complain about the cold insulating qualities, too, so it's pretty clear that Coleman is just trying to cash in on a classic model from the 50's with a POS new plastic box and retro metal skin. And apparently, the newest models now come with a fail-tacular plastic latch. At least ours are sturdy as hell.
Verdict: Hey, it was free.