They are coming from California. But they did not use all MXR parts and the pedals are often not very well made.
Dating mxr pedals serial number - mxr pedals - determining age?
Here is an "MXR" envelope filter I got in for some mods. Note that the parts are random, some carbon comp resistors, some film.
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Also note the parts are not put in straight and some have some leads soldered together on this side of the board for some reason. The original pots are the only way to date an MXR pedal, so this pedal is not very valuable even if someone could get it working, as the date codes and pots are gone.
See my FAQ for date code decoding info. I have also seen these "NOS" pedals turn up with pots with the last digits as which means 18th week.
The original MXR pots have a shaft sticking through the middle on the back of the pot and the numbering on the pots will usually dating mxr pedals serial number with MXR as they had them specially made. Here is the back of the here. Notice the lousy soldering and that the board had several broken traces, which was probably why MXR never used it and probably discarded it.
Someone tried to put jumpers on the board to fix the traces, but it did not work. Most original MXR pedals should have a paper sticker inside initialed by the assembler and final tester. It is divided in four squares and usually under the battery.
There should be a serial number sticker too, usually on the side of the battery.
The ones from California do not have these stickers. If the board is shown with some new looking foam on it, to hide the actual board that is another bad sign. We don't have many old MXR pedals for sale we dont deal with vintage gear much anymore so we are not trying to sell you our pedals instead of these.
We are just trying to help people understand original pedals, which are about twice as valuable as a non original pedal.
14 MXR Pedals That EVERY Guitar Player Should Check Out