Sale:

Link 1: https://backpack.tf/profiles/76561198035664616#!/compare/1677628800/1677801600

Link 2: https://drive.google.com/drive/folders/1ZOinlfiv83NHQHiB_ASeJvMp3Bj-zf79?usp=share_link

625 + vintage bills (36) = 661 rounding to 660

Using a screenshot of sale as I had acquired keys same day they were sold so they were not recorded in the backpack compare. Other most recent sale is out of date, besides that the hat’s history shows the hat moving between what seems to be alternate accounts and are not sales. No other copies of this hat have moved recently.

Going with 660