Another major difference is that there was originally no tone ring. This one has had its rim cut down and a flathead ring installed.
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| Here is a 1950's RB-150.
From a distance this looks exactly like an RB-250, except there is no
Mastertone block and the headstock is un-bound. Another major difference is that there was originally no tone ring. This one has had its rim cut down and a flathead ring installed. |
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