Christine is right to ask for another view of the weight. In fact, it would be best to provide a side view (straight on) and an oblique view (at 45 degrees looking at the top and side). The Charlton Catalogue shows various views - and even then, the photos do not always provide good recognition of all the designs!
But I agree that this is very likely a Caithness weight and that the CIIG in script, rather than etched, is not a problem. As a second, there may be something in the end result that is not too far off the original intention or there may be something quite a long way off. And if something is quite a way off the original design, a "swirl and bubble" weight can, fom certain angles, look rather like many others!
Also, what's the size of the weight?