Hey Kevin, really hard to find information on some clocks especially “newer” ones. Bernie is right about the R & A on alot of different clocks. Maybe you already know this but for someone who may not, the R = retard and the A = advance, basically slow and fast. when looking at the pendulum and the R and A have a arrow pointing to the adjusting nut for the pendulum bob. when you turn the nut to the R, for instance, it will slow the clock (retard) by lowering the pendulum bob. Now I could very well be wrong in the verbiage of R and A as I have read in other places that the English, German or possibly French words used would be different than what I have posted but I am pretty sure it all means the same. Would be interesting to find out exactly. William