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Glossary

M###; Mellone cachet number, reference numbers used in Mellone's Specialized Cachet Catalog of FDCs, with volumes covering the 1940's to the 1960's
MC#; Reference Number from Mellone's Specialized Catalogue of First Day Cover Ceremony Programs and Events
NIM; not in Mellone catalog
P###; Planty catalog cachet number, reference numbers used in Planty's Photo Encyclopedia of Cacheted FDCs, with volumes covering the years 1901 - 1939
NIP; not in Planty catalog

9999; A single stamp, not part of any series, OR a single stamp from a se-tenant sheet, where Scott has given each stamp a unique Scott Number.
9999a; Multiple definitions exit:
- If the stamp is part of a series produced in one sheet and Scott gave only one Number for the entire sheet, then the individual stamps will have a letter designation for reference.
- If each stamp in the sheet was given a UNIQUE Scott Number, then the use of the last Scott Number in the set followed by a 'a' indicates it is a contiguous block of all stamps from the sheet.
- If each stamp in the sheet was given a UNIQUE Scott Number, then the use of the last Scott Number in the set followed by a 'x' indicates a SET of covers - one for each stamp.
- Scott Publishing ALSO uses letter codes to denote different types of complete booklet panes, which typically use a-e

BKLT; Booklet Pane on cover
B#; Block of (n) stamps
Bs; Booklet Single on cover
Combo; Cover with one cancel but more than one stamp. Usually Combo covers are cancelled with other stamps that a relative to the new stamp.
LL; Lower Left
LR; Lower Right
LP; Line pair on cover
M/A; Moisture activated stamp (needing moisture)
PB#; Plate Block on cover, (n) stamps
PNC#; coil strip of (n) stamps, plate number on center stamp
PR; pair on cover
PSA; Pressure Self-Adhesive (not needing moisture)
S#; Strip of (n) stamps on cover
S/A; Self adhesive stamp (not needing moisture)
UL; Upper Left
UR; Upper Right

#6; Standard #6 envelope,
#7; Slightly larger than standard #6 envelope, "Monarch"
#9; Slightly smaller than #10 envelope
#10; Standard business sized envelope
#11; Slightly larger than #10, slightly smaller than #12
#12; Slightly larger than #11
MCD; Maxi-Card. Generally, a card with a printed design made for the new stamp with First Day cancellation applied to the face.
PCD; Postal Card, or Post Card
SLE; slit end on cover
ST; slit top on cover

CDS; Circular double-ring cancellation, typically red/magenta, used for insurance/registry dating, and by request of Customers.
Dual; Cover with more than one cancellation.
- This can be a FDOI cancelled on an existing FDC, combination of FDOI and UO cancels on the same day, or a FDOI and a related event cancel.
- Sometimes the term is used for two cachets applied to one large FDC (ie. Crosby and PM Covers).
FDOI; First Day Of Issue. This refers to a cancellation applied that was specifically create for the First Day Event by the USPS.
FDOS; First Day Of Sale. This refers to a cancellation applied in a location otherthan the FDOI city, where the stamp was released Nationwide.
HC; Hand cancellation
PHC; Pictorial hand cancellation
SMC; slogan machine cancellation
SOTN; socked on the nose cancel
SHC; slogan hand cancellation
KHC#; Killer hand cancel, (#) bars
MC; Machine cancellation
UO; Unofficial cancellation, at a city other than the one designated by USPS.
- The city should have relavence to the new stamp, be it by the city history or the words making up the city name.

GP/GPC; General Purpose cachet
HCD; Hand Colored. Frequently mis-represented as hand-painted. THEIR IS A DIFFERENCE, as any Painter will tell you.
HFD; Hand-Crafted
HPD; Hand Painted
OAD; Over-All Design-- cachet covers entire cover
PATR; Patriotic cachet
RSC; rubberstamped cachet
THM; Thermographed
UNC; Uncacheted cover
UNK; Unknown cachetmaker. A travesty! Identify these as soon as possible!!!