Unless the door hinges have been changed, it's a 24. But could be 24 -25.
The door posts appear to be metal with wood bolted to them. 21's didn't have this. They were wood all the way, IRRC. My 24-25 body had metal door posts as well.
Also, some have said that door hinges for true 25's are equal lengths outside the body, but I have seen both.