10-20-2010, 10:32 PM
FWIW. I'm not saying this is the answer but I came across a similar situation involving a 1938 Zenith 6-S-254. From the factory the 6-S-254 did not have buttons yet this one did. After much research it turned out this was a factory modification, in a way. The 1939 models had buttons and a decision was made to add buttons to leftover 1938 models so dealers wouldn't be stuck with them. A kit was sent to dealers who then installed them.
[Image: http://i863.photobucket.com/albums/ab191..._0599a.jpg]
Larry
[Image: http://i863.photobucket.com/albums/ab191..._0599a.jpg]
Larry