This is another freebie I got from a friend since It was having problems. After further inspection I found the power was grounding out on the enclosure. I asked if he wanted it back since I fixed it and he said he bought the nano version and was happy with it.
This is the 3rd version of the Small Stone pedal by Electro-Harmonix and can be identified by the lack of LED as opposed to the 4th version which has the LED. The 3rd version has 2 LM13600AN and one LM324N ICs and is considered by many to be the stronger and more balanced sounding phaser of all the other versions.
EDIT: All the above would be true but my unit looks to be the a 3rd version enclosure with 2nd version guts. Mine has the 4 EH1048 OTAs chips like the 2nd version. I will need to do some more research and see if this is from the factory like this or was a rehouse/repair. I would not be surprised if this came from EHX like this since they are so inconsistent with the builds.