Usually when the devices are thinned out like that it is from over polished dies. Maybe yes - maybe no - It reminded me of some of the DDR's I've seen. You'll have to wait for the experts to chime in.
Always glad to help out. If you need to copy these for your educational files. Go ahead. If there are credit for someone else on the images, please leave the information as copyright laws want them there to show who took the images. (best to be safe than get in trouble)
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