Antique Seth Thomas triple Decker 8 day weight driven clock with wall shelf

Hi,my new to me antique Seth Thomas Triple decker shelf clack with wall shelf I believe this Seth Thomas clock to be made after 1865 as it was made in Thompson Connecticut the earliest models were made in Plymouth Connecticut pre 1865 it measures approximately 32 inches tall by 18 inches wide it also included a nice well shelf but not sure how to attach the shelf and clock to the wall as the weight are very heave the glass/painted birds are in excellent condition still trying to get the clock level so I can test to see if it will keep/run Time it has a nice coil going and sound very beautiful please leave a comment below if you would like to thanks .