That doesn't look too bad. At least from the pictures it looks like it could still be functional, not pretty, but functional.
Is the area capturing the O-ring still mostly intact?
You may need to carefully clean up some of the rough edges with a very small file, but at least from the pictures it still looks like it could make a reliable seal.
Is that really the older threads, using the Aqua Lung Titan adapter or is that the Metric adapter? It looks like it could be the newer one, but I would have to go look.
Yeah, I just checked, that is not the Aqua Lung Titan or the Conshelf DIN adapter. But it does look like the newer Metric threads. Bryan should be able to get you a new one of those DIN adapters.
That is a relatively new Phoenix. The Argonaut Tom has was fabricated with the older original US Divers custom threads. Only the old Aqua Lung DIN adapters will fit on it.
Buceador con escafandra autónoma clásica.