Ok, here's what's in mine:
Referencing your pic, the left side diode is an ITT ZY6.2, which is a 6.2V zener power diode.
The right part seems to be a plan power diode, like a 1n4005 or something similar. The one in yours is just a different package, like these:
http://i11.photobucket.com/albums/a1...0/SDC11908.jpg
Now I remember where I'd seen that part before - old British automotive electronics.
The "blob" is where the cathode ends are twisted & soldered together.
Edit: The Vectrex uses that style of diode as well.
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