I've spent quite a bit of time restoring a 1920s FADA Speaker box made of Pot Metal (I know it's rubbish). I received it in several pieces and was destined for the tip but decided to take up the challange. I used JB Weld 2 part glue, had to use a file and what ever other tools needed to achieve a satifactory result. The end result can be seen by the before during and after photos.

Photos uploaded.

JB Weld saves the day, yet again. Very nice job.

Yes, a nice job and why not fix a piece of unobtanium.
Good that the pieces were all there.


Fred.

The disintegration of "pot metal" or zinc die castings is because of impurities in the zinc, either as supplied, or because it is picked up in the casting shop by recycling impure zinc from the clean up of the casting. Your casting doesn't look as if it has disintegrated (and it has had plenty of time from the mid 1920s), but rather might have had a misadventure such as being dropped.

A nice restoration of a rare piece.

Alas Fred, it wasn't all there might have to build the missing bits or not depends on time.

https://www.radiomuseum.org/r/fada_15_dynamic_speaker.html

O crap, what I thought was the front is the back!
Ooops. Now, there is a challenge after all.
Fret saw some wood ply to the shape glue it in, silver paint, jobs done!
Sorry just a thought bubble.
I guess the purists would make up a mould, pour a pot metal replacement and then carefully weld that in.

Fred.

I'll most likely do a drawing to scale first but it's going to have to wait, have a few other restorations before that happens as well as my PSA test again in 2 weeks.