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From what I have read concerning Mules, about every article differentiates between the size of the micro numbering between the front and the back of the note and whether it is .6mm or 1mm and also indicating that the microprinting was switched to the larger size 1mm. My problem is that there are TWO plate sets on the front and one on the back. On my 20's, the left side of the front has the number next to "E" as a .6mm and on the right side, the number next to the letter is 1mm. How do I compare the back with the front when the plate on the front has a micro number on the left side that is smaller than the micro number on the right side??? Also, I got the impression that .6mm micro plate numbers were phased out in the newer bills which is fine but my 2013 One dollar bills have .6mm Plate stamp numbers on the right side of the bill. That is two different sets of 2013 with two different Federal Reserve branches: San Francisco and Philadelphia. The left side plate stamp on the one's are the larger 1mm that matches the 1mm on the back. In summary, I have $1, 2013 bills with .6mm on the right front, 1mm on the left front and 1mm on the rear AND $20 bills from 2017 with .6mm on the left front, 1mm on the right front, and 1mm on the rear. ALSO, I have 2013, $20 bills with .6mm on the left front, .6mm on the right front and .6mm on the back. WHAT'S UP??? Thank you for any feedback

From what I have read concerning Mules, about every article differentiates between the size of the micro numbering between the front and the back of the note and whether it is .6mm or 1mm and also indicating that the microprinting was switched to the larger size 1mm. My problem is that there are TWO plate sets on the front and one on the back. On my 20's, the left side of the front has the number next to "E" as a .6mm and on the right side, the number next to the letter is 1mm. How do I compare the back with the front when the plate on the front has a micro number on the left side that is smaller than the micro number on the right side??? Also, I got the impression that .6mm micro plate numbers were phased out in the newer bills which is fine but my 2013 One dollar bills have .6mm Plate stamp numbers on the right side of the bill. That is two different sets of 2013 with two different Federal Reserve branches: San Francisco and Philadelphia. The left side plate stamp on the one's are the larger 1mm that matches the 1mm on the back. In summary, I have $1, 2013 bills with .6mm on the right front, 1mm on the left front and 1mm on the rear AND $20 bills from 2017 with .6mm on the left front, 1mm on the right front, and 1mm on the rear. ALSO, I have 2013, $20 bills with .6mm on the left front, .6mm on the right front and .6mm on the back. WHAT'S UP??? Have the .6mm numbers been phased out or not? Do I compare the right side plate number ONLY to the back and ignore the left side plate number? It doesn't look like the right front plate number and left front plate number match in size very often. Thank you for any feedback