Is it also the same mic as the STC 4033?
I've reribboned several 639's (both the Western Electric and the Altec), own a 639 that's in pieces and looks like it spent the better part of a decade on the bottom of the ocean, and I own an STC 4033.
To me it looks like STC licensed the design, but chose to make their own parts.
Smaller body geometry, smaller magnets, etc.
But yes, the first time I opened the 4033, I laughed at the similarity.
Seth: Glad you got it back and up and cookin!
Edit: I'm now cruising pictures of the 670, and no, the 4033 doesn't look like that either =)