It does say .38 Spl on the bottom, near as I can tell. It would appear to be a catastrophic failure of the barrel shank. Possibly cracked by over torquing or maybe a fault in the steel.

No provision for an extractor rod locking bolt......****ger? You might check factory websites to see if you can match the profile to any maker that doesn't use the front mounted locking bolt and does use a one piece barrel. I looked at current Ruger and the SP101 seems the best bet, but they are currently using a different front sight and have the name on the barrel. Older version?