Retail?

I would put the retail price when originally purchased and then put current price in the description. I am the type not to buy something if I think the seller is spinning any information and I check out everything before I send a stranger money. And I doubt I am the only one like this.

In my opinion,at the time it was purchased. Others will disagree and that's perfectly fine.

I agree with both of you, and certainly legitimate to say that the current price is xyz in the description - always seems dishonest otherwise. Big issue with Manley gear at the moment after their recent price increases.

The price it last sold at, retail is fair.
As long as the price is not for an upgraded model, it does not maatter.
Since nearly everyone actually pays below list anyway, buying new.. it is just a ballpark sort of figure.
(I laugh to see folks asking more than most actually pay in ads for mnearly new gear. Like New XYZ still in box, only $995 list $1050.. yeah, what about the fact they actually only paid $800 for it?)

The only retail price that is relevant is the current price. It matters what it would cost to buy a new one. It does not matter what the seller paid for it.