http://www.potsaa.com/homer-laughlin/

How do you date Homer Laughlin China?
I have a china by Homer Laughlin. I understand that the number / letter sets the date and plant all that was done. However, the series M 54 N5. I do not know how the date because it starts with "M." Someone know how?
Hello, hope this helps a little, or guide you in the right direction. pottery fun so so much. enjoy!
Spinning a plate