This Primary Mirror assembly was found in our Engineering lot from the estate of a collector of vintage Ham Radio, Test Equipment, etc.
We don't know much about telescopes but found some techniques to determine the focal length which appears to be approximately 40-42 inches - this may be incorrect since we are not 100% sure of that measurement technique.
The writing on the side resembles NSIN numbers so this may be from a military application.
Barrel is 17-5/8 inches long and measure 16 inches in diameter at the base and the lip on the top measures 16-5/8 inches in diameter.
The Base plate that the Mirror assembly is attached to is 3/8 of an inch thick and 16 inches in diameter.
Height of the mirror assembly is 4-1/2 inches.
Diameter of the frame surrounding the mirror is 14-7/8 inches.
The visible portion of the mirror is 13-1/2 inches in diameter.
Shipping is likely expensive because of the size of this item.
If you do not want the barrel and just want the mirror assembly, shipping would be less - contact us before purchasing if that is what you want to do.
Previously used condition with scuffs, scratches and marker writing on the barrel. Mirror is pretty nice with barely noticeable fine scratches.
We typically ship within one business day! International buyers are responsible for any customs/duty fees.
Most of the parts we sell are vintage New Old Stock parts. We are have identified fitment information to the best of our knowledge in the description of this listing or the Compatibility Table. It is possible this part fits other vehicles. If you have fitment concerns, please contact us.
We use high quality shipping supplies and biodegradable peanuts to make sure your parts arrive safely.
NOS (New Old Stock) parts are Genuine Factory Original parts.
NORS (New Old Replacement Stock) parts are original vintage aftermarket parts.
NOS and NORS does not necessarily mean the parts are perfect.
Manufacturing technology was not the same as it is today so imperfections should be expected.
Also, these parts may have been in storage for 40-80 years and could be dusty, greasy or have surface rust, spider webs, etc.