That is kind of odd I know if it's got the plastic ID cover on top than it's at least a 61 as opposed to the 56 pack but if it's marked as an issue pack maybe it's newer model?
As far as I've been able to find the 61's were used up untill the early 90's at least but I've never been able to find anything on if they ever issued newer versions after 61 and before the more modern packs.
Hopefully someone else has some ideas 'cause I'm interested in seeing what suggestions ppl have.
Good luck in finding a definitive answer.
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