These cymbals were included in the auction of the WW1 vet US army drummer (see other posts). These cymbals have a lot of patina. The mount is included for one and I believe the other would attach to the top of the bass drum via a mount. I don't see any stamp on the cymbal or bracket. Are these rare? Valuable? Should I clean them or is the patina more valuable?[Attachment: 71534]

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[Attachment: 71537] Thanks for the assistance!