That's a cool artifact, but several things don't add up.
The manufacturer's serial number 3787 was an F4U-1D BuNo 57746
JT200 was manufacturer's number 1005 (AKA BuNo 17702) - often known at Vought as an F4U-1A or F4U-1B (though neither designation was official.
The Mfg serial should be the airframe serial, since engines (and their serials) could be changed as necessary.
If the aircraft was BuNo 57746, it would have had water injection, making the engine type an R-2800-8W.
At some point, someone will be able to explain this. Until then, I'm lost about the meanings of all this!
Cheers,
Dana