So, back in the late '40s, there was a record label outta Portland called Castle. Castle was the (presumably) exclusive label for the Castle Jazz Band.
The Castle Jazz Band used to play out of the Castle Restaurant down in south Milwaukie, above the Clackamas river, which was recently demolished, I think.1
Found the above record label-piece in a rubbish bin, only loosely connected to the shattered remains of a 48.
1 Or so reports the always entertaining Schlockstar.