I agree with Richard, also check for stress marks on verso, pen pressure will vary on a real signature usually at the beginning and/or end but won't on a stamped sig. Jewelers loop is helpful there too.
There is another handy gadget with a black light built in that has a loop for magnification , it fits in the palm of your hand and can be bought for around $75.00-$100.00, Maybe less , Sometimes the device can show you in a matter of a few seconds what you need to see and is also good at detecting if any modification has been done on a baseball or non-flat
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