Up for sale is a NOS Clock for a 1977-1978-1979 Chevrolet Impala,Caprice.And maybe 1980-1981-1982-1983-1984 don't know for sure.Being a NOS clock I think it would be best to get it service,since it's over 35 years old.I don't check anything on a NOS clock.As is.It will come in the original box & the instruction sheet.Thanks for looking........