Xeramic’s 1570 service example than the cal 3085 example he used in regards to teeth shape/position. I’ve learned over time to look at teeth shape/position as a good guide. The teeth are positioned higher (relative to the numbers next to them) on both of my examples, and the teeth on both my examples are also shaped the same.
Obviously the fonts on mine differ. When did rounded 3s with open 6 and 9 start? Also, did service ones not have the black concentric ring around the wheel next to the teeth?