Televue uses two fairly parallel production companies, one in Japan and one in Taiwan. I think that's what the stamps indicate. Their stated reason was, I recall reading on Cloudy Nights (the Nagler Mythos article by Trusock or similar) the value of having two suppliers for safety, and b/c they'll keep each other competitive....
also per Tom Trusock's article, there is NO difference in quality between the sites. All are made to rigid TV specifications. No fiascos (bottles) make it out with the TV stamp, they say!
and there are some cosmetic blems (no optical flaws) out there with a little 'dent' after the focal length number stamp, to so identify them..
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