Posted 21 July 2012 - 11:12 AM
To me, this camera looks like a 1976/1977 model that had an ACL II base added later. Everything coresponds to the late 70's model : motor, viewfinder, small details on the body... Also, the ergonomic handgrip and its attachment on the body are not standard, so they were also probably added later.
Look at all the info that I put on eclair16.com to help with the dating of these cameras, and a lot more info too. Regarding the viewfinder, yes it is removable easily. But yes, if you want to trade it for another kind of ACL viewfinder; you have to have the matching mount. If you do, it's easy, as it's only attached with two screws.