Mints generally don't include coins from multiple different years in their official sets, especially years that are several decades apart. To make such a set, a mint would either have to stockpile a bunch of old coins just in case they needed them in the future (unprofitable, so unlikely), or purchase a bunch of the old coins they needed from secondary-market sources like coin dealers (also unprofitable, and unlikely), or restrike the old coins for use in the new sets (a controversial practice most mints avoid doing, as producing official mint restrikes does tend to damage the market value of the originals, thus angering coin collectors - the very people they'd be trying to sell the sets to).
So as a general rule of thumb, whenever you see a "coin set" where the coins have all different dates, it's a privately-produced aftermarket construct.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis