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Duped, but only 1 in existence- thus, using the sale.
Sale #1
Sold on April 18, 2019 for $89.99
https://marketplace.tf/items/30069;5;u64
Keys that day were $1.77
https://marketplace.tf/items/5021;6/Mann%20Co.%20Supply%20Crate%20Key
89.99/1.77 = 50.84. Rounding to 51.
No other sales. Going with 51.