Just had a quick look on Wikipedia, I know, I know, it's not the all knowing source of info some people think it is, but the speed was confirmed, just looked at the Mk I model, however it said that speed was at 18.500 feet altitude.
Has to be coarse prop pitch, obviously, and I am sure with WEP enabled as well.
And no, I am certainly not getting that speed in level flight at 6000 feet, in a shallow dive/ trim slightly nose down flying straight just loosing altitude slightly pretty good speeds can be achieved, however impractical in combat, since your turn rate and roll rate are horrible at speeds too high or too low for that matter.
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