Royal Canadianicon Navy used paint of that hue for a lot of things. It was tough, too, would take a lot of beating about, as with just about anything destined for shipboard use. I have a box of Oerlikon spares about here somewhere, just about that colour.

Teflon I would rather doubt, though. Tough stuff, yes, but not Teflon. Teflon (polytetrafluoroethylene) was only invented by accident in 1938; its first large-scale industrial use seems to have been to do with the UF6 separation equipment at Oak Ridge, during the Bomb project. I remember when the first Teflon-coated frying-pans came out; the stuff was regarded as pretty much of a miracle at that time. It was several years later that I read of it being used to coat bullets in an effort to get the MV up and keep the barrel-heating down; M-60 was eating barrels too fast, 'way off in some place called Viet Nam. We heard more about it later, of course, but that's the time scale.

Somebody owes me 1 cent, mostly because this really isn't 2 cents' worth.
.