Update 24 march 2022: added KIM-1 Re v photos from HomeComputerMuseum (thanks Bart!)

The KIM-1 went trough several revisions without any change to the specifications. The first revisions appeared as MOS Technology products, the label MOS in in the front top right corner. When Commodore took over MOS late 1976 the label changed to Commodore C MOS.

MOS did three versions, the unnamed first one, a Revision A and a Rev B. I have never seen a Rev C.
Commodore MOS did Rev D to G, starting in 1977 and well into the 80ties. Many KIM-1s were sold, first to industry and later to education and hobbyists. Nowadays KIM-1s are not rare but have become quite expensive, collectors value especially the early ones with a white 6502 IC. The KIM-1 was an OEM product by Rockwell, with its Rockwell branded documentation and a Rockwell sticker at the right top part covering the Commodore MOS label. I know of at least two versions by Rockwell, a Rev D and my Rev F.

See this page for images of the revisions known to me.