MXR Phase 90

I bought this in 1979, probably made in 1972 as shown below in Serial Number.
Works well, sounds more realistic than newer totally digital units, but also makes
more hiss to go along with the swoosh. I like this effect on a drum break such as
Mitch Mitchell on Axis Bold As Love.
Asking $75 firm.

Serial Number & Inspectors Initials

I may be wrong about this, but I seem to remember that the boys & girls in Rochester
New York didn't do consecutive unit serial numbers, but by date of manufacture.
If this is correct, this unit was whipped into shape November 9th, 1972 by the
second shift.
Gotta love the initials of the guitar test person scribbling right through everyone else.