UM = Unmounted mint.
FMM = Fine Mounted Mint.
AMM = Average Mounted Mint, will have some defect.
FU = Fine Used, with moderate postmark.
GU = Good Used, a sound stamp with heavier postmark.
AU = Average Used, slight defect such as pulled perfs or slight thin.
SF = Stamp with faults, such as trimmed perfs, thinned, small tear.
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