The "manufacturer" is always either MCC (Mitsubishi) or TY (Taiyo Yuden) for Verbatims.
I think you refer to where (which plants) there are actually made under Verbatim's control?
You can tell from the serials at the hub.
There is a recent thread explaining how to tell form the serials in the Blank media section, can't remember which one, you'll have to search a little
Also on the package of your Verbs:
Made in India= Moser Baer India plants
Made in Taiwan=CMC magnetics plants
Made in Singapore=Mitsubishi plants (not 100% sure of this one)
Made in Japan=Taiyo Yuden plants