Details of a stamp in my main collection

CID1
StampRef5463
SetRef0
CStateUS
ItemID15561
CoverID
Qualityfine
DescriptionCentered slightly right and high; good perfs, rather heavy doubled cancel
CollectTypeMain Stamp
CommentUnpriced used in the catalogues; very rare, possibly unique?
Location8
Multiplicity1
PurchaseID4036
PricePaid50.95
CurrencyGBP
Accession20240919
Disposed

There is one example of this stamp in the collection.