You mean lugs. Camera strap lugs. Some M5s have 2 lugs, camera strap lugs on the same side so the camera hangs vertically. 3 lug M5s have the usual 2 on either side plus one below the lug on the rewind side, so the camera can hang lengthwise. M5s were only available in chrome and black chrome.
Below is pictured a 3 lug, chrome M5. The extra lug is below the one on the right, looking head on to the camera.