Ingraham

This is an Ingrahm "dollar watch" as they were called. These were very inexpensive unjeweled watches that are often not designed to ever be serviced. I sure recommend against ever taking one of these apart. They were originally assembled with special jigs, and without that, assembly can be next to impossible. 

Some "dollar watches", so called because early ones literally cost one dollar, are riveted together and can not be disassembled.