It sold for 12 keys pure in 2 days. 10 keys was a sale that happened off market completely and may not be representative of value. Will keep this up for a bit to see if we get another sale

I was the 10 key sale, but that was within a few hours of the owner listing it @10 keys. The owner commented on my profile that another person had offered 10 keys as well. The same person added me and offered 10 keys for the unusual.

Additionally, when I was trying to sell it, I got an offer of 11 keys in the comments of my auction. https://scrap.tf/auctions/4LDHPN

I do not have screenshots of the offers I received or anything because this was a long ass time ago, but hopefully this could be of some use. :)

More sales:

Quicksold for 11 Keys

http://backpack.tf/profiles/76561198000485231#!/compare/1492646400/1492732800

http://backpack.tf/item/5327022295

I think the biggest concern here is not necessarily that the sale at 12 was quick, but that 10 is going to be too low based on how quickly these sales took(and to a lesser extent, the offer of 11 pure above). I think what you should do here is look into a full price suggestion for the prussian(which should end somewhere at 12-14), and resuggest using that sale as the high end while also excluding 10.