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Well i hate to disappoint you but to date there is no photo that shows what Hartmanns final mount looks like in its entirety, it is a possibility at best....in fact I'm not even sure he flew the K-4? files to check!
IIRC the last aircraft that can be shown photographically as Hartmann's is a G-10.
He also did a stint in 262s I believe. I must admit I haven't seen photos of this one either and that I was relying on the depiction in the instruction sheets as having the markings normally associated with Hartmann's machines.