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Who here does not love Ebay, not only for purchasing lenses (sometimes which even live up to expectations), but for the amusement value of some listings of people less, shall we say, in the know about these things. Here is a listing for an A28/2.8 (actually doing rather well at $82 at the moment), but it's no ordinary A28.
SMC Pentax-A 1:2.8 28mm Lens Very Rare Serial | eBay
That's right, this lens has a rare serial number. So rare that the seller could not find another of these lenses with this very same serial number on the internet.
Dare we even imagine that this be the only A28 made with this serial number?