Mechanics are 9 (out of 10) -- Tested on F3.

Battery check is working.

Battery contacts had small corrosion, but cleaned up.

Serial number: 251776.

For Nikon F3 series cameras ONLY.

Tip for Nikon F3 users: When MD-4 is attached to your Nikon F3 camera, there is no need to have battery in the camera, MD-4 will power your camera.

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