This lens says "Raynox Tele Auto MC 3.5 200mm" - any idea what mount it could be?
This appears to be the Minolta MC/MD mount. The giveaway is the aperture actuation lug inside the bayonet mount, and the notch in one of the bayonet tabs opposite the aperture lug, at the upper-left position of the bayonet ring in your 2nd photo.
Note, that "MC" probably doesn't mean MC mount in this case. It probably means "multi-coated".
Reference: Rick Oleson's lens mount identification page