Antique Watch

[deepriver]

I have three ladies watches. One says banner and has nothing on the back, but on the face it has a smaller clock on the bottom of the face. The other two are bulova.  The numbers on the back of the bulova's are L70516 10K rolled and has gold written on back-can not make out the rest yet. The other has m1 10K R.G.P bezel stainless steel back- no. W158266. How can I tell what year they were made.