I think its technically an RSK Mk1.2

Here's my thinking:

Mini S30V steel Mk1 = Mk0.8 (based on blade length -- 2.88"/3.44" = 0.837)
S30V steel Mk1 = Mk1.0
M2 steel Mk1 = Mk1.1
M4 steel Mk1 = Mk1.2