Not sure which Weber is considered an "equivalent". I've heard of people ordering the ceramic Blue Dog (C12B) with a smaller 30 oz. magnet to approximate the Greenback sound, but I haven't heard one myself. I've owned the regular 40 oz. version of the ceramic Blue Dog though, and it's a nice speaker.
Actually if it's a G12H 30W you're looking for than Weber's ceramic 1230 is the one. Especially if you go with the cloth surround (55hz - bass cone) model. The quality is impeccable (Celestion's china made reissues are no match for these) and they sound great. Once they're broken in they aquire that smoothness/sweetness that the originals are famous for. 4 of these in a 4x12 and you're ready to rock!!!
Why not get a real Greenback. Great if you can find a vintage one
but I just picked up a new one to match with a G12 H30 and as
far as I'm concerned it sounds great.
I was also concerned about this made in China issue with Celestions but after talking to Dave from Avatar and Randall
Aiken who has recommended this speaker for his amps they honestly couldnt tell any difference and I agree with them. Now the G12H30 I guess is a different story although I have never
heard a M.I.C. one.
BTW Kudos to Avatar for a real professional experience in dealing
with him and his company. Not bad coming from the land of
potatoes, or is that potatos