Nice kit! It's highly doubtful that the rail consolette was factory-original/added -due to the fact that the two arms are from different periods of time. My guess would be that it started out as a Gold Coast kit and then the former owner decided to convert it to a regular, "sit-down" kit by adding a railmount in the only available position, i.e., in the "front" (closest to the resonant head) -as opposed to the "back", as would be the case with a true Jazzette baby bass drum. It would seem that the idea, although well-intentioned, is flawed -in that, those straight bass drum spurs, in conjunction with the railmount being in the front, would cause a balance problem -unless a rather unconventional positioning of the railmount's "L" arms was employed. That's my reasoning why it probably isn't a factory installation. I mean, it could have been special-ordered that way...because anything is possible...but I would bet against it.
Burgundy sparkle is a nice color -even when I've seen faded versions of it, it is still very pretty -looks like root beer!
I don't know what the value would be for it, but I know that people will pay crazy money for those little bass drums -I did!