For sale/trade: Challenger (Gottlieb, 1971), price reduced!

This very rare 1971 Gottlieb Challenger head to head pinball machine is in 100% working order, and is a fun novelty to add to your collection. It is missing the access door on the 2nd-player side. I bought it that way, and was going to have a woodworking buddy make one for it, but its overall condition is not bad at all for a 45 year old machine, especially the playfield art, which is pretty nice as you can see in the pictures. I considered having it restored by a high end restorer, but ultimately decided to keep it original. It includes the wiring schematics.

I've priced this to sell, at $1750, since I want to free up space at that end of my basement; I'm embarrassed to say how much I paid for this :p but I really wanted to have all four head to head pins, and these are so hard to find.

I'm open to trades too, particularly for a nice RFM or a good tournament machine (I can add cash depending on the trade). Let me know if you have any questions, and thanks for looking.