I have a black UR (1978) 2000FC body. It retracts the shutter when I take the back off, but from my understanding that should be a 2000FC/M. The metal feeler is underneath the shutter (where the serial is), where as 2000FC/M's feeler is at the top. The side rail says "2000FC". From searching on the net FC/M's say "2000FC/M" on the side rail. I found one just like mine on Ebay (except it's chrome): http://cgi.ebay.com/250721665089 in this photo it shows the metal feeler under the serial: http://www.digifan.cn/photo/2010113164431.jpg 2000FC/M's weren't introduced until 1981, so is it possible that the previous owner upgraded the body so it retracts the shutter?