Very interesting! There were a few markers that made me think it was one if the very early ones, notably that very small fuselage star. As a side, I was very tempted to do the very early prototype style Hellcat with the early markings and two tone scheme.
Beginning Weathering
Here's a technique I haven't used in a long while, salt chipping.
The thing with pacific aircraft particularly the Corsairs is that using chipping fluid is extremely tempting to provide interesting weathering, salt chipping on the other hand is a bit awkward to use with that type of weathering as there's a good chance that you'll accidently cause more chipping when removing the salt even if you put a clear coat between them.
On the Hellcats though I didn't use chipping fluid, so I thought I'd dust off this technique I haven't used in a good while.
Unfortunately I definitely overdid it in some areas, perhaps I put too much white in the airbrush but some areas are quite overdone particularly on the left side of the aircraft. I tried to sand and polish some of the paint off and tone it down, but for now I'll leave it as is and see how a clear coat and oils effect it.
Furthermore I did also did a dirt wash on the model, this strangely got very stuck to the underside of the aircraft (perhaps the salt chipping on the underside, done in a very thinned black, wasn't dry enough yet) but to fix this I just sprayed over it with white. In the end if the blue does look too dramatic this will be the final option to fix it.
Overall though it doesn't look too bad, maybe a bit overdone but it's right on the verge between too much and just right. Either way though I do like the potential salt chipping has in breaking up colours like blues and blacks which overwise can come across very monotone, and it does seem fitting for an aircraft living in the salty seas. For the downed Hellcat I'll make sure to be a bit more careful with the white/thinner mix! Instead of doing a small poor from the bottle a drop or two from a cocktail stick in a half filled airbrush cup works better.
E: Of course I forgot to mention the stencils, they were actually a bit of a pain and kept folding up on me. I forgot how delicate Cartograf decals could be as it's been a while. Either way, both Hellcats got them though naturally I got lazy with the grounded Hellcat and didn't bother with the underside.