12.5" Dia Cassegrain convertible Mirror with cell and 2 secondaries

For Sale is a 12.5" Cassegrain Convertible mirror and cell. F5.55 for Newtonian (1762.00mm) and F24.55 for Cassegrain (7794mm) . Mirror was ground under the careful tutliege of the Adler Planetarium in Chicago in the early 1990s.  Mirror is considered Research Grade and has details regarding the quality of the mirror surface.  The mirror cell is a Kenneth Novak floatation cell. The mirror and Cell was planned for a DIY TUBE Homebuilt but was never completed and then a death caused this to go up for sale.  I am not including a price at this time as it is difficult to price this. I am taking reasonable offers. The price as shown is only to get this ad approved.  The secondaries are as follows: 3.1" minor axis wave length is 1/10th 4.0" major axis and holder. C2 coating or 96% reflective.  The Cassegrain secondary mirror is designed for (4x) or  F24.55 FL. same coating and reflectivity. Holder is also included.  If you are interested, contact me and we can discuss.  This equipment is fresh and has never seen first light.  Thank you.