BIGMUFF Pi Russian Black: A Russian-made Big Muff with a black enclosure. My absolute FAVORITE Big Muff. I have 3 of these and am thinning the herd. This one has never been gigged with. Bought in 1999 and has been stored in my music room since. Has some minor scratches and the battery door has some missing paint. No Box included. This pedal works great with no issues or scratchy pots.

Pedal details:

Circuit Board Number: BM-1-01.00.001, 3.000.0001
Circuit Designer: Based on Bob Myer's original circuit 
Editions: 2. First edition with heavy six screw box, and second edition with four screw light weight box 
True Bypass: First edition-no, late second editions-yes 
Power: 9V battery only. To connect to a standard Boss type AC power supply, use a 9V battery adaptor like the 1 Spot CBAT.
Enclosure Size: 6 1/2" long x 4 3/4" wide x 2"tall / 165mm long x 118mm wide x 50.5mm tall (not including rubber feet) 

This small box black Big Muff was the final version of the Russian made Big Muffs. The circuit was a favorite for modders because it was very easy to change components for customizing the tone and gain. It was essentially the same circuit as the Large Box Black Russian and the Bubble Font Green Russian that preceeded it. It sold for much less than the reissue USA Big Muffs that were made at the same time, but the costs for New Sensor to have these made in Russia had increased over the years. This resulted in smaller, cheaper, and less expensive enclosure boxes than all the previous Russian Big Muffs. Unfortunately, the manufacturing costs the St. Petersburg factory charged New Sensor eventually outweighed the demand, so the V8 was discontinued in 2009. The introduction of the USA made Bass Big Muff, based on the Russian circuit, was one possible cause for the decline in sales for the Russian made Big Muffs, but overall E-H was not happy with the Russian build quality. A future collectible? Almost certainly.