Gus Dudgeon also was producer for "Spring's" only LP, and Al Kooper's
"NYC,You're A Woman" LP .By no small coincidence,there's MK-II throughout.
There's a sleevenote on the Kooper album saying "thanks to Gus Dudgeon and Spring for the use of the Mellotron", so it was one and the same instrument.
Aaah - could this be the infamous chicken"Koop"er MKII ?
Ken M.