zo Reichert U.V. 6 UV6 Dark Field Darkfield UV Condenser Objective in Original Case - Vintage, Made in Austria

<p>The plate holding the lens is 2 3/8 dia x 5/32" thick.
The I.D. (bottom shown in box) is 1" and has fine threads.
The inner dark disk is approx 13mm dia there is a 1/32" clear ring then the balance is dark for a total lens dia. of 7/8"."</p>