Hi David,
I think you have one of the late silettes with the shutter release on the front of the camera.The color apotar is one of the better triplets around and I think you won't be disappointed with it's performance.I have a shot of a train taken with a silette with 3.5 solinar in my gallery which may give you an idea on what to expect from these cameras.Welcome to the site and happy shooting!
Cheers,Randy