The later type, it is the 14th of 19 in total, examples 15,16 and 17 were type 2D variants, this one is one of two type 2C variants, the other, built for John Walker, is pictured near the start of this thread. The last couple of Monos, 18 and 19, were fitted with 1100 cc engines, Bob Mills' car (the 18th) was assembled sometime in 69 and has type 600 suspension from new.
The Hotchkiss Mono has inboard fronts and Cosworth Mk XVI engine and Mk V Hewland box. Not sure if all the 2D variants had out board front suspension, Garrie's personal car, MD 6755 certainly had outboard front and rear suspension.
I note you mention that you have been able to reunite this car with the 300, does that mean you and Rod have recently purchased it from the states?