Quote: KP= Krause Publications, it was a magazine subscription promo item. However, those promo sets do generally contain decent coins.
Indeed! These are one of the only sources for Gem '82-P quarters.
There were several companies that made '82 and '83 mint sets and one persisted right up until 1986. I sometimes suspect the mint set only '87 halfs were to deter this competition.
None of these privately packaged sets had a very high mintage and the KP ones were probably highest. They made a fairly significant number but the majority of them would have been spent by the recipient almost immediately.
Krause is not really relevant, it's just that some companies made their own mint sets to fill the hole left by the mint. But since it's not a mint issued product, the value is never likely to be above the value of the coins alone.
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