ISMACS gives the date the serial numbers were allocated, not the date the machine was made. At best you can assume your machine was made between that date and the date of the next allocation, though it's unlikely they ran out of numbers to put on machines before they allocated more. I'm sick of seeing people take the date of allocation of 50,000 or more machines as the date their particular one was made. I think that is why Singer only gives year, as they don't have records more accurate than that. The best part with the ISMACS site is you can use it to help determine your machine model - though it only work sif you look up the right number. I came across someone on Ebay that looked up the serial number on their electric motor and thought they had a machine from the late 1800's. It was really one from the mid 1920's