Re: two tone Becker Costaniuc, thanks very much for the additional detailed photos. These do answer all the questions I asked, the serial number stamp on the front plate of the movement is in the identical location as these first three batches made, so there is no variance there. I see the serial number on the pendulum is five digits lower than the one on the clock, being 1685030 instead of 1685035. This is very close, and in such instances there is always the possibility that the pendulums were mixed up at a retail shop where they likely didn't pay too much attention to such detail if they had several of this model for sale. They all look alike, so no worry if the numbers don't match. You have quite a nice clock and being such early date is one of the few still remaining. Thanks again for showing us your treasure!