My research a year or so revealed there are about 100 plus in existence, maybe ten in restored quality, probably less than 25 in daily driver mode, the rest are for all purposes just VIN numbers.
That said, rare is in the eye of the beholder, I do not see the Bronco climbing even to the desirability of a mid 50's pickup truck. Small cab, low top, hard to see out, old school hard to drive four wheel drive. Top price for restored stock one is around $25,000. Interestingly, restomods have more money potential as those have the items folks want, AC, PB, AT, nice seats, stereo, etc.
If it's cut, you have just lost the all original claim.