The 'real-world' Curtiss XF13C-1 was designed in 1932 as
both a monoplane and a biplane.
The aircraft first flew as the XF13C-2 biplane, it was then converted to the XF13C-1 monoplane
configuration, back to biplane fro USN tests, and then again to monoplane with a larger engine
and reduced height vertical tail as the XF13C-3. Three designations and one serial number BuA 9343.
Interestingly Curtiss proposed a land-based version to the Army in 1933 as Project EX-38479,
the Army said 'no thanks'.
As to the designation of an alternate universe navalized Hawk 75/P-36, personally I'd be inclined to
use F14C, as in the new timeline it would predate the 'real-world' XF14C and XF15 projects. Those
two would, in turn, then be bumped up to XF15C and XF16C, which could cause no end of consternation
in certain circles.
:tagger:
... and of course there would be fixed gear and float versions of any navalized Model 75.
:yarr: