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Sale at 10 ref:
http://www.tf2outpost.com/trade/24784260 (look at history)
Sale at 8 ref:
http://www.tf2outpost.com/trade/25237828
You'll need more than 2 sales unfortunately to prove a price suggestion.
The market for clean S. Mantreads (no parts and no killstreaks) is pretty small. This amount of evidence should be OK.