I just noted a nice example of the Pike chair on Ebay right now (use search terms “Madison” and “Umanoff” if curious. It is missing one arm, but I think one could be fabricated by duplicating / mirroring the other side. Not sure about the “Ebay” policy here, so won’t say anything more; I can say that it is NOT mine, and I am sorely tempted by it, but you have to draw the line somewhere and, um, my wife just drew it. All kidding aside, I drew the line myself. Its not exactly dirt cheap, but probably not bad either for a piece of mid-century modern furniture.
Also noticed Ralph Miller is auctioning a lovely Burke 115 bridge chair as well.