You meant back then without an external meter, I shouldn't bracket an image with a whole roll of 12 exposure film, to make sure one had the right exposure? 🤣
Shocking what we got away with back in the day, ain't it? Especially with black-and-white, it was amazing what you could fix in the darkroom as long as you hadn't underexposed the shot too much. Ever hear of a "burger-and-a-beer" printing exposure? That was when the negative was so dense that you'd turn on the enlarger, go out for a burger and a beer, then come back and turn off the enlarger and develop the print. (Ya didn't get tips like that from Ansel Frickin' Adams!)
are you sure, that P on the camera means 'professional' ? to my knowledge it means program, the camera chooses the combination of aperture and shutter by itself.