Matrix Runout
The alphanumeric code etched into the dead wax of a vinyl record — the most reliable identifier of a specific pressing.
Flipback Cover
A 1960s UK vinyl sleeve construction with a laminated front cover folded around to the back.
VAM
A die variety classification system for Morgan and Peace silver dollars, named for researchers Leroy Van Allen and A. George Mallis.
CGC Grading
Certified Guaranty Company — the dominant third-party grading service for comic books and a major grader for trading cards.
Full Bands FB
A grading designation for Mercury dimes that show fully separated horizontal bands across the central fasces on the reverse.
Caliber 321
The column-wheel manual-wind chronograph movement used in the original Omega Speedmaster — the watch worn on the moon.
Key Date
In numismatics, a key date is the rarest and most valuable issue in a coin series — typically due to low mintage.
T206
The 1909–1911 American Tobacco Company White Border baseball card set — one of the foundational issues of pre-war collecting.
Franken-watch
A vintage watch assembled from mismatched original parts of different periods or references.
Etched Holo
A specialized holofoil pattern with an embossed, three-dimensional texture used on premium Pokémon TCG rarities.