Well what makes you say that? Mel Lewis, Art Blakley and Elvin Jones all played burgundy sparkle RB kits so some of the rarity was probably created because of them...
But nonetheless a good question, I don't think so not too much anymore is it rare? The prices on regular Burgundy sparkle RB kits are about the same as a regular wrap RB kits... and I've seen a few burgundy sparkle Gretsch RB kits floating around but I will say this... it took me several years to find myself a 100% all original burgundy sparkle Gretsch RB bop kit.
Now as far as holy grail goes... I own a real 1963 burgundy sparkle RB bop kit that I feel is very unique and could be "special order" because it doesn't have the Pratt muffler or standard factory cymbal mount ever installed on it when 99.9% of them did...
And plus... what really stands out about my burgundy sparkle RB kit is that it has the original W&A rail mount factory located at the 12 o'clock position which is why, I truly believe my burgundy sparkle RB bop kit (is the holy grail) and COULD HAVE once belonged to a famous jazz drummer... unfortunately my hunch is currently non-documented but both E.J. and A.B. played RB kits with this very unique configuration which is supported with several photographs showing the 12 o'clock position but I've never seen this configuration in regular hands past or present.
Over many many years of searching, I only know of a few (less then 5 original RB bop kits) with original 18" Gretsch bass drums that has the factory 12 o'clock W&A rail mount position and none of them are burgundy sparkle.
