youngoldbloke
The older I get, the faster I used to be ...
Sorry but I don't understand how you didn't notice the clamp was broken when you fitted the saddle, and if you did why didn't you act on it then? I'm surprised the saddle wasn't already fitted to the post - that's how the one on my Rose was delivered. You should be able to find out the brand by checking the original specifications. Rose often fit Ritchey seatposts. I don't think I've ever seen a steel clamp on a carbon seatpost (or on an alloy one, for that matter) - they are usually cast. If you are worried fit a new seatpost, but any carbon one could potentially fail catastrophically. Maybe an alloy one might put your mind at rest?