Originally posted by Vendee Yes I understand what you are saying but the OP has posted two pictures where the light spots are in different positions and he has posted pictures where there are no light spots. I understand what you are saying about shooting immediately after winding but it only takes 1/1000 second to leave an impression. The OP also said that only 5 or 6 shots came out with the spots. I personally don't think its the curtains but we'll all have a better idea when he runs another roll through the camera, preferably using film from another batch.
My assumption from the discussion here and my understanding of a FP shutter is that the leaks are in the second curtain and further back. If it were the first curtain, which I think is closed most of the time, he would probably have a spot of some kind on more exposures. If it is the second, then so long as the shutter speed is 1/60 or less, the shutter opens fully, and the back end of the second curtain is not exposed, so no spots would appear. Only if the shutter speed gets fast, and the slit gets small and moves across the film, does the back end of the second curtain unroll and come into play. There could be more than one hole there, putting spots in different locations, and the beams of light could be bouncing around.
The real test of this theory is to record the shutter speeds for each exposure and look at the leak. If it is happening at X-sync and slower shutter speeds, then my hypothesis is rubbish. All of these shots seem to be in fairly good light, so one can't guess from looking at them what the exposure information is likely to be.