Military SCOTT DSV Mouthpiece

I do not know what military rebreather this mouthpiece goes to. If you have the information as to what system belongs to please let me know. I was advised that it was used by the US Military on a rebreather system and it is very well made. The one way valves are dried out and would need to be replaced before the DSV is to be used. There are 2 to choose from and the choice is first come first serve. One has a slightly darker mouthpiece and is marked EMERSON (the last 4 pics) so if you have a preference please let me know when you buy one.

This just in from a customer.

These are the original Scott DSV Mouthpieces that came on the original MK15 and MK15.5 military rebreathers. They are 1" and with rubber covers fir 1.5" hoses. They also used these on the Emerson Lung o2 rebreathers and the commercially available CCR1000 which was the commercial version of the original MK15 rebreather.