Sterling Valentine has metric. However, as these are phillips head screws, it's the thread that matters, and the ones that holds "the ears" of the pickup, it doesn't really matter. The frames are wooden screws and are metric too. If you need to screw them off and on repeatedly you may wear out the wooden threads in the body wood soon. The metals screws for the ears of the pickups has very little material in the actual ears, as threads to make any significant difference or wear in the long run.
I am pretty sure Indonesian made Sterlings are metric, and EBMM original made in USA are imperial.
