TRH-2L 7909X4753 ? unknown item from US tank ?

[roadrunner]

Hello

I have this item for 15 years and forget it in a locker.

 

What is it ? Part of a night vision glass for a tank ? Which one?

 

It is marked "TRH-2L" and "7909X4753" if I read it correctly.

 

1. Under the two glasses is at the left side a arrow showing down and "SCREW OUT".

2. In the middle under the glasses is "OPEN <-> CLOSED" and should be to the lever underlying.

3. On the right side under the glasses "IMPORTANT ! - CLOSE THE SHUTTER - WHEN YOU HAVE FINISHED THE WORK"

( Number 1 and 2 are stamped into the metal, number 3 is in white letters on a black shield )

 

Any idea about the value ?

 

Thank you for your help.

 

HAVE A NICE DAY

Michael

[roadrunner]

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