I talked to Jim this morning, and he was a great help. The clock is a Chelsea made during WW I. The case is a Seth Thomas. According to Jim, since the Chelsea fits in to the Seth Thomas case, and the Seth Thomas fits in to the Chelsea case, this is not uncommon to see this marriage, which would have occurred during maintenance. The mounting holes on the case should line up at the top with the 12 position on the clock, mine does not. That was Jim's initial indication that the clock and case were a marriage. He suggests that since the dial is so nice, that I try to find a Chelsea case. Any help finding a 6" Chelsea screwed bezel case would be greatly appreciated.