04-14-2013, 01:18 AM
I think that many of these American Bosch sets use paper labels that would give the model number and the tube layout, it would have been either inside the cabinet or on the bottom. Another maker you could look under is Northern Electric, for some reason those used chassis identical to an American Bosch fro a number of years, same with American Westinghouse.
Regards
Arran
Regards
Arran