How about a 1.83" minor axis premium pyrex diagonal mirror in very good overall condition from Discovery that I sent to QSP for their 99% dialectric coatings before they stopped serving the amateur community (that was a mouthful)...
This is a great secondary that showed some of the brightest, cleanest views ever from my 10" before I swapped it for a 2.14" and sold the scope.
Now to get critical: there is the slightest bit of "wear" around the extreme edge of the coating in a few tiny spots--very insignificant in my opinion and should be hidden by the lip of most holders. There are also perhaps two or three very tiny pinpoint (not pin "head" ;^) sized spots in the field. Again, extremely insignificant and they may even clean off--I haven't tried and won't.
The coatings alone cost $65 and are hard to come by these days (if things still are as they were...)
First $75 shipped in the US takes it, OBO. Money order for immediate shipping. Personal checks okay with a hold while they clear.
I'd keep this mirror in a heartbeat if I didn't need a 1.52" instead.
Thanks for looking! ;^)