Circling Peace Sign Private Eye

Original Price: 1.4-1.6 [11 months old]

Original prices are used and overpay is applied.

http://www.tf2outpost.com/trade/18635463 - Orbiting Planets Samur-Eye [1 bud, though the price is slightly outdated] + Bushi-Dou [0.9 keys] + Specialized Killstreak Collector's Half-Zatoichi [~9 keys, see below] + 3 keys

Total sale: ~1.7

There are currently no Circling Peace Sign Private Eyes for sale, and I can find none that have sold recently.

Collector's Half-Zatoichi mini-suggestion

http://www.tf2outpost.com/trade/17359558 - Sold for Collector's Beggar's Bazooka. Worth 6 keys now, was priced at 11-16 keys at the time.

The Collector's Cloak and Dagger offer is worth 11-12 keys now, was unpriced at the time.

None of the other Collector's Half-Zatoichis on OP have sold or gotten offers.

http://steamcommunity.com/market/listings/440/Collector%27s%20Half-Zatoichi - 3 sales in the past 3 weeks, at $16, $17.25, and $23.03. Those are, respectively, ~7 keys, ~7.5 keys, and ~10 keys, taking keys at their price on the market (~$2.30 most of the time).

I'll take the value of a regular old Collector's Half-Zatoichi as 7.5 keys based on this.

The Collector's Half-Zatoichi in the trade is Specialized. Specialization kits sell on the Steam Community Market for a little under 2 keys. http://steamcommunity.com/market/listings/440/Specialized%20Killstreak%20Half-Zatoichi%20Kit

That means we'll call the final value of the Specialized Killstreak Collector's Half-Zatoichi ~9 keys.