This one is weight-driven, not spring (the first weight-driven clock I have that isn't a grandfather or a cuckoo). When I got it the cabinet was complete but broken; it's missing the pendulum bob, the crank key, and weights. It appears that I have everything else.
I believe this is a "Connecticut Shelf Column" clock, if the collector's guide is to be believed. At first I thought it was an O.G. but I was just looking at the top and bottom, which are ogee shaped, but the laterals are not. From poring over photos on the internet, what makes this a Connecticut Shelf Column clock is that tall, boxy shape and the two columns on either side of the door. Seth Thomas seems to have made a number of them.
If I read the info correctly, Welch took over Forestville Clock Manufactory in 1855, and ran it under the E.N. Welch name until 1902, when it became part of Sessions. I'm not sure when it was made; from the Collectors Weekly article it's post 1855. The movement plates are held together by pins rather than screws, and it's weight-driven rather than spring. The Official Collector's Guide dates it around 1872, so I'll go with that.
Doesn't run. It's a tough one. I had to buy the weights from a parts house and they just barely fit inside. The weights are cone-shaped, taped just a bit smaller on top. But they're very coarse and I fear they'll abrade what's left of the paper inside, which is already heavily worn. Also had to buy a pendulum bob for it. Guessed on that one.
Why doesn't it run? Not sure. My father identified a worn pivot and we bushed it. The works look like it ought to run. I'm not sure if the weights aren't heavy enough and it just lacks power, or something's binding up. Tried different weighted pendulum bobs thinking that might be it, but no such luck. So right now it's just looking good on top of a bookcase. I'll come back to this later when I know more about clock repair.
An interesting thread about repairing may be the same clock (slightly different cabinet)
An article about the history of Welch and its antecedents from Collectors Weekly
Acquired: May 2019 from a thrift shop.
Current condition: Doesn't run.