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Here is the back of the 12-S-232.  Notice the 670 ohm speaker (Zenith part number 49-183AB).  This speaker is nearly impossible find because it was only used on the 12-S-232. It is always easy to tell a piece-meal 12-tube Walton, because this speaker is usually replaced with another one, and the silvery-white painted model designators are rubbed off!