Please forgive me if this topic has been covered before (I am new to the group and loving it!) but I have a question about the age of the Simplex clocks I have been collecting. No matter how old they are (or aren't) I just love these old school slave style clocks but I honestly don't have the first clue if what I am buying is 30 years old or 5 years old and I was just wondering if there is a way to tell. I have quite a few of these clocks and I have noticed some subtle differences in their faces. The logo is different on some of them and some of them just say "Made in USA" at the bottom while others say "Mady By Simplex Time Recorder Co., Gardner, Mass. U.S.A." and I am hoping that these little differences may help me when trying to determine their age. Any help with this would be greatly appreciated. I will post pictures if necessary of some of my favorites.