Albinos, while a true error, are valued as freaks. A bit more unusual as a precancel than as a plain envelope. A U532b (not a U532) is a type O stamp impression the in the precancel catalog. By elimination, if your envelope was normally printed it would be $1.5, $2.00 or $3.00 depending on the knife and watermark. So, your albino version should be worth $5.00 or $10.00. An EFO collector would probably pay on the higher side.
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