Sargent #3408 Type 3 Transitional Smoother
Note the Sargent design has machine screws holding the frog to the frame. Others have wood screws directly into the wood base. This make for a better design in my opinion. It provides a more solid support for the frog, and the machine screws will not loosen like the wood screws.
(My #3408-091120-2)
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