The ONLY revision 2 wildcard 88 I've seen with the coprocessor sold untested on ebay in 2019 for 46k USD. I happen to know it was purchased and donated to cambridge computing museum. (I believe the Even the leading edge embedded model D units do 250+ on ebay untested or parts. The coprocessor is a Intel C8087-4 and they are quite rare to get them in a 16 bit interface the wildcard 88 uses. Its part of my mantra to check ebay and the vintage forums to find one.
BUT, in addition to this recently I also got a non working intel pentium pro OVERDRIVE socket overlay. This was a stop gap for people who spent 10-12 gand on the machines while intel fielded pentium II (300+ percent improvement). It amounts to a pentium ii on a slower bus.
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