*Rare* Rikenon P Macro 105mm f/2.8 Lens (Pentax K Mount) (1:1 Mag.) (with Caps)

Description

For sale is a used Rikenon P Macro 105mm f/2.8 manual focus prime lens. It's for Pentax K mount cameras. It has 1:1 macro magnification (no adapter is needed to achieve this magnification).
Please note that the 'P' setting on this lens' aperture ring has no function on Pentax K mount cameras. In other words, this lens will function like an 'M' series lens on Pentax bodies. However, on Ricoh film bodies the 'P' function enables auto metering and auto aperture.
This lens does have the infamous Ricoh pin, but it doesn't get stuck on Pentax bodies (at least not on a K-1 or K-3).
Please see the last two pics for sample images I took using this exact lens on a Pentax K-1 (not included).
Lens Condition
Lens body cosmetic condition: Very good with only casual signs of usage. Some of the letters and numbers painted on the body have rubbed away a bit. Otherwise, the lens body and glass all look excellent.
Inner elements free of fungus, haze, and separation: Yes.
Inner elements free of dust: There is
moderate fine dust
within that you can see when holding your eye up to the lens. However, I don't see any noticeable impact on photos.
Focus ring makes a complete rotation: Yes.
Focus ring rotates smoothly: Yes.
Aperture blades open and close completely: Yes.
Aperture blades move quickly and are free of oil: Yes.
Filters can properly screw onto the filter thread: Yes (52mm).
Lens caps included: Yes, a Kiron brand front cap and an original Ricoh brand rear cap.
Lens hood included: Yes, this lens has a built-in retractable lens hood.
Lens filter included: No.
If you purchase this lens, you agree that you are purchasing it AS-IS. Unless I have given incorrect info or misrepresented the lens, I do not offer refunds. I do my best to accurately describe the condition of my used lenses, and I do not try to hide their flaws. Look at the photos yourself (what you see in the photos is exactly what you are purchasing) and make your own judgement. If you want to know more, please ask questions before you buy.
Shipping
All purchases are shipped via the United States Postal Service (USPS).
Your package will be very well packed with lots of padding to make sure it stays well-protected through transit.
Purchases made before noon central time, Monday through Friday, will be shipped on the same day.
Purchases made after noon, Monday through Friday, will be shipped the next business day.
Purchases made on Saturdays before 10 AM central time will be shipped the same day.
Purchases made after 10 AM on Saturdays, or made at any time on Sundays, will be shipped the following Monday.
I will happily combine multiple purchases into one shipment to reduce shipping costs. Prior to your purchases, please message me for an invoice.
I do NOT ship internationally, but international purchases made through eBay's Global Shipping program are fine.
Payment
I only accept payment via PayPal.
All Buy It Now purchases must be paid for immediately.
All Best Offer and auction purchases must be paid for within 48 hours.
Buyers who don't comply will be reported as non-paying to eBay.