The Talking Machine Forum — For All Antique Phonographs & Recordings

Might anyone have one of these lurking in their spare parts or know where one can be sourced? I started working on the soundbox for my Japanese Columbia 203 portable, and when I got it apart, I saw that the aluminum diaphragm was badly corroded and actually eaten through in large spots. It was not salvageable and went into the trash.

I used to see these occasionally on eBay. The Phonograph Shop has none. John Nagy at phonographs.org has none. I'm kind of at a loss as to how to proceed.

Any help is appreciated.

Charlie