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<p>[QUOTE=&quot;johnmilton, post: 24615017, member: 101855&quot;]I am quite sure that the pre-1936 Proof coins were only wrapped in tissue paper. When left in that paper for long term storage, the silver coins frequently acquired the blue toning frequency seen on those coins. </p><p><br /></p><p>In 1936 the coins were slipped into celluloid sleeves which were stapled together if it was a set. Starting in 1950, the mint sold complete Proof sets only. The coins were in celluloid sleeves stapled together. The celluloid was changed to plastic in mid 1954, which was not a good thing. It made many coins go bad. </p><p><br /></p><p>The flat packs started in mid 1955. Hard plastic stated with the 1966 Special Mint Sets.[/QUOTE]</p><p><br /></p>

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