Hi all,
It's been suggested that I start a thread about Mustang designations, so here is what I have. I've omitted mention of the A-36, as I don't think this variant was ever named in the series by we Brits, we didn't use them, but borrowed a few for trials I believe.
British
US Fighter
US Recce
Mk I
None
None
Mk Ia
P-51
F-6A
Mk II
P-51A
F-6B
Mk III
P-51B & P-51C
F-6C
Mk IV
P-51D
F-6D
Mk IVa
P-51K
F-6K
Confusing isn't it? (But not quite as confusing as Bf 109G variants perhaps ) Note how although the US P-51(no suffix) is equivalent to the Mustang Ia, as there was no use of the Mk I by the US. But the FR P-51 was the F-6A. Even more confusing, but logical given the preceding, is that Mk II = P-51A = F-6B, as F-6A had been already allocated.
Just for completeness, the Mk III did not differentiate between P-51B and C, and nor does the F-6C designation.
Which brings us to the Mk IV/P-51D/F-6D and IVa/P-51K/F-6K - It's almost as if someone said "We need to sort this out!"
Main references:
Allison-engined P-51 Mustang https://ospreypublishing.com/uk/search/?q=Allison-Engined+P-51+Mustang
The Mustang Story https://www.amazon.co.uk/Mustang-Story-Ken-Delve/dp/1854092596
Comments welcome, and hope this is of use.