England 375:

By July 1460, at the Battle of Northampton, another York victory resulted in the capture of Henry whilst his wife fled to safety in Wales. She would soon rally together an army in response to the news that Richard of York had declared himself heir to the throne.

Item 1:

https://backpack.tf/item/16392538347

ignoring bot dump

Sale 1:

https://backpack.tf/profiles/76561199229477354#!/compare/1762646400/1762732800

https://backpack.tf/profiles/76561197988341178#!/compare/1762560000/1762819200

counted 13 keys on buyer side

13