Rick

From what I was told, the 5-4 did not appear in the RMK catalogue until 1998. But( the Capt. famous word) I have a 5-4 with 7 spacers (1972 or earlier) and a SP 13 stone (1969-mid 70's) and a Baby Dot sheath.

I will try and find a picture and post it.

The above did not answer all of your questions, but perhaps it is a start.
_________________________
Rod Brown
RKS 3846
RKCC CM-123
Whether you think you can or can not, you are right.