A week ago I posted some pics about this vintage CCM. According to the serial number, it should be a 1928 model. I started taking it apart to re-pack the hubs and clean everything up. There were some questions about the type of hubs:
1- The front hub just says "CCM" on it.
2- The rear hub is a coaster. The writings say "New Hercules Brake", with one patent number and another line that says "Parent pending". See picture below. Do these inscriptions fit with the predicted age of the bike? I managed to completely take it apart, clean it, grease it and put it back together (see picture). My first time with this type of hub.

I have not yet cleaned up the bottom bracket because I don't quite understand how to take it apart. Please see the pictures below. What would be your suggestion?

I took the chain off. It is VERY rusty, so I think that I need to change it. What type of chain is needed?

See also the picture of the seat. Ever heard of this company? I am wondering what to do about the rusty springs that are below it. Should I just brush them with a steel brush and leave them like that or should I paint them black? What could have been the original look?

I would appreciate any suggestions.