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Here is a vintage 1987 Proco Rat distortion pedal. The little serial number decal is long gone but the pots have mid 1987 date codes so I'm pretty sure this is an '87 pedal. It was made when they were still using the LM308 chip, and it even has a builder tag with the Pat and Marty names on it (apparently these tags are sometimes found in Rat pedals from this era according to online info). The pedal works and sounds great with all the classic Rat tone you want. The pedal shows the usual cosmetic wear and tear from being almost 40 years old, but nothing drastic. I'm including photos taken from all angles so check them out to see the condition, etc.
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