Is it really a 150K Dual Pot in the RM-1?

[A.J.]

Dusted off my Maestro Ring Mod in another attempt to tune it properly (this seems to happen every couple of months - never get it quite right) and was going over the schem and noticed that the dual pot looked only to be a 50K dual on it - searched around and it seemed the same on any other copies that I found - is the 150K value a correction of the schem or a mod from the original?  Just kind of wondering...

A.J.