Hi Sam,
I thought it was a 6-4, the steak knife. It is a #6 grind though. Or a 7-5 with a #6 grind like this sold one on Capt. Chris's page
http://www.captainchrisstanabackrand...in/catalog/671 I guess if they did it to a #7 why not a #4? looks very odd. Not seen one although a search did bring up one and a mention of late Perry Miller's special "Glades Hunter"
https://www.worthpoint.com/worthoped...ind-1887135557 interesting.