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Another offer of the very rare ones for the legendary SMC Pentax-A 3.5/15mm.
It is on eBay Italy, delivery worldwide. but a hefty shipping fee (as nearly always with offers from Italy).

SMC Pentax-A 15 mm. F3.5 Full Frame K1 boxed ultra rare KA 15 3,5 | eBay

[rawr]

Even in the old days, this lens wasn't a best seller. So a rarity indeed.

But Pentax had the right attitude towards such exotic lenses in those days.

[gofour3]

Yep 1981 was during the glory years of Pentax, when everyone knew the brand.

Phil.

[RKKS08]

Now I was curious and searched.
I found 2 more of them, plus 2 with a modified mount for Nikon.
The better ones with original mount are:

Pentax 1:3,5 15mm SMC Objektiv | eBay
Pentax Asahi SMC 3.5/15 mm #5067226 Lens | eBay

But from the descriptions it seems they are either not in a near mint condition, or/and not absolutely complete (caps, box).