Analog and Power Supply Board
There is information on the Internet that Macintosh Classic and Classic II share the same analog board. This depends on the revision on the board. In case of my machine the analog board is slightly different to the one in Classic and I noticed the Classic motherboard does not work with this analog board, but Classic II board works well with the Classic analog board.
The set of control knobs at the back of the analog board have no description on the cover, so here it is fixed:
Hard Disk Drive
40MB Conner CP3040A
Floppy Disk Drive