Nice example. The bezel is very difficult to find by itself. If the watch has sufficient sentimental value for you the best bet would be to buy the same watch for its bezel and then send that one off to Aldo in Italy to be redone
http://www.milwatchmaker.com/principale.php
It can't hurt to ask Aldo or Achim (watchyouwant) if they have any idea on where to find one separately.
I've also had success in the past sourcing some really rare parts from Rory here:
http://mechanicalwatchsupply.com/Home_Page.html
And no, the 024 and later bezels will absolutely not fit this watch. Even among the different straight lug seamaster 300s there are tiny differences in fit between references.
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