07-24-2008, 02:42 PM
From what I have seen which is limited to 1936 and 1937 models, 1936 models have black knobs and 1937 models are brown knobs. The limited number of pre 1936 models I have seen have black knobs. The 1938 models I have seen had brown knobs. After 1938 I have no clue.
Bill
It's not what you don't know that hurts you it's what you know that's not so.