Electro-Harmonix Small Stone Phase Shifter V2 1970s

Description

Vintage 1970s Electro-Harmonix Phase Shifter v2.  Comes with the original box but not the papers.
I bought this second-hand some 20 years ago and have barely used it.  I've futzed with it in my bedroom but never gigged with it.  To the best of my knowledge, there have not been any modifications or tomfoolery with this pedal.
The pedal works just fine.  The cosmetic condition is very good.  There is no rusting or noticeable text/graphics fading.  However, the previous owner did scratch his name and telephone number into one area of the pedal (see images).
I know people open the box and check the pots for dates, etc. but I don't want to mess around with this thing and screw it up if I don't need to.  If you really need to know the date, message me and I'll figure out how to open it up and check for you.