JBL 123A woofer

As mentioned, the Alnico magnet JBL 123A (made in two different versions..) is not in production, but here are the TS parameters:
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The latter ferrite magnet JBL 2213H (also out of production) had similar TS parameters.

Art
 
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JBL provided this data in 2009? Good find. 😳
It was the twoofer used in the L-100/4310.
I'm intrigued to know why the OP is looking for that speaker, perhaps to replace a permanently damaged one?

http://audioheritage.org/html/profiles/jbl/l100.htm
In the late 70`s I had the pleasure of using a pair of L100 century, for a few weeks, and I loved the bass it produced and it looks damn good and sturdy too.
If I was lucky to get two, I would use it for diy with some modern mids and tweeters