Hey thanks for responding my friend! I actually found out that they go back even earlier, how early is a tough question... I found a guy that collects blocks and rebuilds them.. He explained that the first ones were bronze and brass like the one I posted.. then they became steel . This one had a wooden body to it that obviously rotted away... I'm trying to still find which country most likely made this design. Many designs have the linear bearings attached to a center arm instead of them being attacked to 2 outer discs... It's going to take more time...