I would never have a problem accepting a Heiser as a Hesier, particularly when it is a Heiser!! That 4-6 is on the cusp if you will. I will restate that the switch in blade grinds was not an immediate occurrence with some older blades still showing up, and some holdover of older style grinds from guys making the change. This is happening even though we see knives from 1963 with the newer style grind.

What makes this interesting is the sheath has the RMK logo and horizontal at that! This has always been attributed to the earliest of Johnson's sheaths. The first link below is another with what you would call a “Hieser looking’ sheath but with the vertical logo.

The second link is most definitely a Heiser, even if you couldn’t see the back of the sheath. It is obviously different than the 4-6 or the 1-7 “Johnson” sheaths. With those, there is some question, without seeing the back. So, as a rule if it has an RMK logo, to me it is a Johnson until someone can prove otherwise.

http://cgi.ebay.com/Vintage-7-spacer-Ran...id=p3286.c0.m14

http://cgi.ebay.com/Vintage-Randall-Knif...id=p3286.c0.m14