I would agree as above = a Billy Gladstone kit would fit the "uber collectable kit's category. This kit is currently owned by Carl Palmer and it is for sale at this time. The bd, floor & rack toms were built for Morey Feld ....the snare with this kit was built for Cozy Cole. There is a drum battle video with Gene Krupa and Cozy Cole where you can see Cole playing this snare drum.Of the four kits Glastone built there are only two full sets surviving - this one and the one Chet Falzerano owns.The last four paragraphs at the maxwelldrums.com link below details the history of the kit.This photo and most of the information above were taken from the website link here:http://www.maxwelldrums.com/carl-palmers-billy-gladstone-drum-p-5910.html
Gary Carl has had this set For Sale for many years he even dropped the price to $25,000.00. it has even been played on ELP shows, Celebrity owned multiple times, and documentation to boot ??