The chamber wall thickness looks pretty stout - at least a 3-frame. That's a lot of metal to rupture through.
There appears to be quite a bit of rust under the top rib suggesting maybe a dip in water, or worse, saltwater at one time. The corrosion likely had some effect on the way it blew but my guess is some sort of obstruction. Remember in "Finding Out For Myself" it took 31,000 psi to finally destroy a Parker with composite barrels and I don't think that one blew out as severely as yours.
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