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I decided to NOT bid on the Gene Cafe described in my original post. Upon looking at a variety of other pictures I found on the web of other used Gene Cafes, I did not see any others showing so much discoloration. I suspect that it was used a lot more than for just a "few dozen batches" as claimed in the eBay posting.

I'm keeping an eye out for a nice used Gene Cafe on eBay as I am trying to avoid the temptation to pay full retail.