Welcome to abwaluyo I am going with Max about the R and TM meaning Registered and Trademark Registered for a trademark will likely be an older tool as it hasn't been for sure approved at he time and TM will be newer as it was approved Datecodes inside the handles of the Surge will likely prove the theory I am sure exceptions to this can always be found though
Perhaps I have never really paid attention to all that kind of stuff
True Poncho. Leatherman failed in their efforts to patent the PST in the early days, so they registered the design instead which gave them some means to go after other brands copying the design. This is probably a similar strategy they did for Surge. Trademark typically relates to the product name. I’m no expert on this, so maybe others can chime in.