RARE Weston Aviation Pilot's Self Indicating Thermometer, Vietnam ?

Description

I have for sale a rare Weston pilot's thermometer.
I believe this is a Vietnam Era piece. It came in a grouping of military pieces. However, it is a pretty rare item and I can't find much about it. However, I am fairly certain this is a pilot's Vietnam thermometer.
It is in very good condition.
If you have any questions and/or need more photos please send me a message.
Thank You