I would go through this thread and get some idea’s from what rattle did
If it’s an uncommon/common I think the fastest way is to look at the side for the graphite layer.
If it’s a holo it might be easiest to look at the rosette pattern such as the ‘P’ in Pokemon as was pointed out in one of the videos
Edit:
www.elitefourum.com/t/microscope-resource-thread-update-video-9-on-page-4/23015/1
(Test) Link