The cap crimper PST in black oxide is rare, but they do show up on a regular basis. A cap crimper PST in stainless finish is an exceedingly tough jewel to find. I've let two get past me, and they are the only two I've seen.
The early riveted PST's come in two main flavors:
1) The very first ones say POCKET SURVIVAL TOOL. They generally do not have lanyard attachments. They only say LEATHERMAN on the plier pivot, not USA and not TOOL. (which is usually the best way to spot them on crappy eBay pictures)
2) The next generation of PST's with rivets have the large font LEATHERMAN on the handle. This can usually be noted in the auction photo.
(prime77 photo)Good luck finding them Mat! They are more available than I once thought.
Bob