My old wall clock

I currently have an old wall clock that I was told by one repairman was probably manufactured in the 1860's and some of the items are secured by pins, inside the clock where the pendulum swings is a label that say's it is a clock manufactured by Danny Pratt's Son's and includes a writing of Salesroom #4 and an address of Union & Marshall in Boston Massachusetts, the actual city of Manufacture is not readable but another item on the label say's it is an 8 day spring clock. I just wish to find out when this clock was actually manufactured, by the way it still runs but I have to wind it every 7 day's instead of 8 and this is due to having a new mainspring installed.