TheSkySearchers

Who would be the ATM that made this mirror?
I come through this request help from colleagues to try to identify the origin, or what was the ATM that may have made this mirror.
With 99% certainty it is a mirror that came to Brazil from the USA more than 10 years ago. It belonged to a teacher already provided and the current owner was unable to explain the origin.
It is a 317.5mm at f / 6, with 1 "thickness and pyrex glass. Secondary 65mm on the smaller axis also with pyrex with 15mm thickness.
On the side there are inscriptions of your measurements in inches, something that is not used by us Brazilians beyond the initial LK.
If anyone has any information about a similar mirror, or if they've seen something similar, I would like to leave a comment here.
I appreciate any and all help!

You do pose an interesting question. I cannot determine who made it and it looks like no one else can either.

What is great is that you apparently plan to get it tested thoroughly and then decide what to do with the optics. I hope the optics are great just as they are and you can just build the telescope around them without added expense!

Man, that stuff looks like its well built.