Any idea what this diaphram is for?

[Wardsweb]

Found in a box. Any clue what it fits?

[Wardsweb]

Do you think it may be for a 375?

[Earl K]

The subject matter in your pic looks to be the same as seen in the following pic;



Which is a W.E. 594 diaphragm .

[Mr. Widget]

Do you think it may be for a 375?

Doubt it. It may fit though.


Widget

[Wardsweb]

The subject matter in your pic looks to be the same as seen in the following pic;



Which is a W.E. 594 diaphragm .

Awesome, thanks

[more10]

Google picture search says "port hole" :-)