Look inside the soundhole to see the neck block. If what you see is rather narrow and has end grain showing, that's a good indication the guitar was built in the Spanish tradition and the neck will not be removable.
If the block shows side grain and looks wider, then you might have a dovetail neck joint, or something else. . .
It does have a block that shows side grain . The repairman said it is not a Spanish heel joint . He has never worked on a Petersen before and still is unsure as to how the neck was fixed to the body .
These shots will not help much but the one shows the string height and the other shows the top cracks . The guitar is at the repair shop now . I will try to get some photos of the inside block next week
Will try to get better shots later
Well, it doesn’t look spanish.