Adding an RMD is *always* a good thing to do. I have 2 of the 4th from the right in the picture above (black G10, black blade).
ISTR that there were at least 3 different batches of RMD's made, a first batch for a show, then a production run, then another batch for a show (IIRC the last batch was slightly different, didn't have the rounded swedge on the clip).
The two that I have are both black G10 w/black blade, so you'd think they'd be indentical, but they're not. The coating on each is different (one is coarser-grained and shiny, the other fine-grained and dull), the SRKW stamp on each is a different size and the handle scales are *very* different in thickness on each.
I think only Eric knows for sure all the production details, what varieties were made when.