[PC] 1 of 1 Strange '72 Burstchester

Good day, fine folks. This is my first post at Reddit (yay!)

I have acquired a Strange Unusual Burstchester recently, the effect is '72. The current price on bp.tf is about 175 keys, with 1 seller on Outpost asking for 200 keys. This gives me a good sign that my taunt's value is naturally higher, but how much exactly? I'm not new to trading, but it's first time for me to get hold of such a rare (collector, perhaps?) item, thus I direct my question to you. Thanks in advance!