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Message:: [QUOTE="19Lyds, post: 1920578, member: 15929"]I could live with that but then it's still speculation unless you actually worked at the packaging facility. We do know that mint sets, from at least 1964 had sealing gum on the envelopes.We also know that proof set envelopes has sealing gum on the envelopes.1968 Proof Sets came in sealed plastic lens while mint sets continued to come in envelopes that had sealing gum.In 1973, the mint sets came in envelopes which had no sealing gum. Was the sealing gum there just because nobody had ever considered making an envelope without it? Or was it there for the purpose of sealing the envelope? Was it dropped in 1973 since "We never seal the envelopes anyway?" Were most sealed and some simply not sealed? Was this a mechanical operation where the envelopes were stuffed by machine? Or were all 3.9 million stuffed by hand? Lots and lots of variables where not all are products of greed or deception since nice coins have come from both sealed and unsealed.[/QUOTE]