Details of a stamp in my main collection

CID1
StampRef19580
SetRef0
CStateMNH
ItemID15058
CoverID
Qualityfine
Descriptionblock of 4, rough perfs, centred low, buff cloudy native paper
CollectTypeMain Stamp
Commentitem 9.6 in purchase 3733. Chan did not list the 16c on `cloudy native paper`, but the paper of this block is as described by Chan - `smooth on front & rough on back without lines. Cloudy shadows appear it is viewed against light`.
Location6
Multiplicity4
PurchaseID3733
PricePaid22.92
CurrencyGBP
Accession20230927
Disposed

CID1
StampRef19580
SetRef0
CStateUS
ItemID15066
CoverID
Qualityfine
DescriptionPerf 11 pair used. Well centred. West Szechuan dotted cds, date unclear.
CollectTypeMain Stamp
CommentUsed in West Szechuan - possibly GPO print?
Location6
Multiplicity2
PurchaseID0
PricePaid0
CurrencyGBP
Accession
Disposed

2 different examples of this stamp were found in the collection.