https://backpack.tf/profiles/76561198043625371#!/compare/1546041600/1551225600 - seems like it was rather sold for a Scorching Flames Crit Clock, not the modest. The Modest history does not match whereas the Crit Cloack does.

However there's a new sale here:

https://backpack.tf/profiles/76561198254487535#!/compare/1552608000/1552694400

https://backpack.tf/profiles/76561198043625371#!/compare/1551657600/1552780800

Which easily seems like it's over 300 keys in hats.

With the Crit Cloak having a matured seller at 150 the sales would be too discrepant here. This is probably best left outdated.