I have a #41A in a box in the garage. It came out of a "12" Drop Octagon" and the Seth Thomas book indicates that one of the appropriate movements for the 12" Drop Octagon is the #41A. The 12" Drop Octagon is the same clock that some called the short drop school house clock. Message me of you want to discuss it.
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BTW...the "12 inch" Drop Oct. does not have a true 12" dial so that is most likely what you have...shoot a picture on your next post.
IF you have the original movement, why do you want to switch it out? What is wrong with it? I have yet to see a Seth Thomas type 41 movement so badly mutilated that it cannot be "brought back from the dead", so to speak.
I get it...the dial is 11" at the time track...sounds like a 12" drop octagon...once again...would you measure from the center of the hand shaft to the end of the bob? I am pretty sure it is not 9 1/2".....a 12" drop octagon measures approximately 12 1/2"......from the center of the hand shaft to the bottom of the bob.
You know, I think you are right. I don't have the clock since I returned it to the client while I searched for a movement.
My measurement from the handshaft to the tip of the suspension rod was 9 and 1/2. I have an Ansonia Schoolhouse and I measured the Bob and it is about 2 and 3/4. So if I add it to my 9 and 1/2 its just about 12 and 1/2.