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I have never seen this lens, or even heard about it. I can't imagine it's worth what they are asking ($3.8k!!), except for those extreme collectors. Not even in great condition... I wonder how they got their hands on it. Anyone got more info on it? The lens database entry here is pretty sparse.
It's listed on eBay as well, but at $4k. They always sell cheaper on their website than eBay because they don't have to pay the eBay fees.
Used Asahi Pentax 100mm f2 Takumar Lens 100/2 M42 Mount RARE in 'Good' condition
Ebay link (usually lasts longer after a sale, in case people want the pictures of the lens)
https://www.ebay.com/itm/Asahi-Pentax-100mm-f2-Takumar-Lens-100-2-M42-Mount-...QAAOSwK5tgHCSL
Some people may know I am an affiliate with UsedPhotoPro with my own website/YT channel. This is
NOT an affiliate link, as that would be inappropriate on this website of course. Just wanted to clear that up. I do however recommend them. I have ordered several items from them this past year. They are very good about their pictures and descriptions. Everything I've ordered came as expected. Good company.