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Update: I found out that these are 2" thick V-150 blocks, NSN 2990-01-276-9530. Listed for sale here: https://www.steelsoldiers.com/threads/armored-vehicle-bulletproof-vision-blocks-for-sale-nsn-2990-01-276-9530-p-n-112467.213036/

EDITED TO ADD: Visible glass area (excluding the frame) as measured mid-top side to mid-bottom side, is 4" on the outside glass surface and 3.25" on the inside glass surface Ok, sorry for the delay, here are the vision block photos and measurements. As you know, the blocks are two...

I'll get the measurements tomorrow, have been sick for the past three days. That's what I get for visiting family over the Christmas holiday.....

I obtained about a half-dozen vision blocks (used, fair condition) from an eBay auction a few years ago, they came from a police department. They look dimensionally (length/width/height) the same as a V-100 block, but are only about 2" thick instead of the normal 3" for a V-100 block. I had...