![]() ![]() These sets house denominations of cents through dollar coins. State Quarters proof sets form a very diverse collection. By 1999 collecting proof sets was well established and popular. Proof coins were displayed with thematic graphics printed as backgrounds of the insert.īoxes housing the proof sets also include additional artistic images. Notably in 1999 graphics appeared on the insert within the case. ![]() ![]() Between the years 19 proof sets and their design were modified slightly. Each coin was separated from the other and the thin plastic was some protection against the elements.Įxpansion of the number of sets, included design changes to the set packaging as well. Production of proof coins assembled into packaged sets began with the "flat pack" in 1955. Note: Chart is an average of retail listings.
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