Cheap Attribution Trick

I'm just using the Osburn/Cushing book to attribute a Seated Dollar and thought I'd pass on a decades old trick to the younger collectors.
I've taken a clear flip and bent it over so that I can touch the sharp edge with a black marker leaving a hair-like line on the plastic. I never bothered to make the dark line until today as it is only needed to show my method in the image. Then I slip the coin into the flip while placing the "line" where I wish to measure. In this case along the back edge of the "1" to see where it crosses the shield. Have fun!
Note: This works on all coin types and to check for die rotation.
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Comments
Oops! This might help.
https://youtube.com/watch?v=BJs_L7yq5qE
As I said, this is something I've been doing for a long, long time. Surly, others have done it before me so when I saw you post a UTube video, I was prepared to see an old presentation rather than a band.
All I saw was "Cheap Trick" in the title.
I saw that band more than any other, but I never went to see them. They were always the backup band for other groups for many, many years.
The youtube is showing a concert. I don't get it?!
But I do get @Insider2 plastic flap trick... 
Why don't all of you "cool out" and watch The Who video "My Generation" video and think SLABS?
Pete
Good trick... I used a calibrated lens for a microscope for a long time... this is easier... Cheers, RickO
Cool Trick!!!! Oh, is that another band? Nice Flip Trick. Little by little, I'm learning coin stuff that a lot of you experienced pros take for granted.
Thank you. Very good trick indeed. This is helpful.
Cheap Trick was the first concert I ever attended.
Complete Set of Chopmarked Trade Dollars
Carson City Silver Dollars Complete 1870-1893http://www.pcgs.com/setregistry/showcase.aspx?sc=2722"