Well here's my debate. This looks exactly like a 1/72" flat head Torx screw to me. Actually from this image I'm convinced it is. I have no idea what the screw under the clamp would be, perhaps it's a brass slotted screw, but why would they use two different screws? And why brass at all when they tried to conceal the grafex logo on the clamp with aluminum foil tape just to have brass screws stick out like a sore thumb?
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Yea i didnt think torx were popular enough in 75 or 76. Ive always gone by MR for the same reasons stated here. Just like the hero Han Solo gun.. theres always room to hone our knowledge or rule things out. (Remember the straight knurled knob discovery recently?
I actually see a phillips head here, faintly, and it takes up most of the screw head