High quality from military equip.

Outside has some signs of age / exposure but it is a sealed type so insides are perfect.

Hard to see in picts as it is clear, but there is thick sealed glass on face

MOD 350 

RECT TYPE

PART 270

Tested with audio- meter deflects OK

fits 2.75" hole

outer face ring 3.5"

face ring removable

2.25" deep inc terminals

12 oz