1. WELCOME to the board!
2. Here is a cleanup of the pic that is rotated and focused on the bobbin area.
[ATTACH=CONFIG]477897[/ATTACH]
I would say that Macybaby is your best bet here to answer this. I believe that she has both types of Standard machine and is quite knowledgeable on the variations of machines in this timeframe. (I collect 1901 and earlier)