Hey, I'm not cheap! I'm thrifty. But thanks, anyway.
I discovered this by opening it to put in a new roll, so the 1st 3 shots are ruined. A check of the shutter and aperture settings suggests it's either PANF or FP4. So, I'll just shoot remaining 9 at 100. That's a good idea about stuffing the box end into the accessory shoe, if your camera has one. This Compur shutter doesn't even have a flash sync.
Refer to the sentence that I bolded above. If you are sure that it is either Pan F or FP4, then it would make more sense to expose it at 50 ASA. That'll be fine for either of those films.