Schild 2063 25-jewel: 1971-1974 Airman 1 and SST with A. If the serial number was 649813 for example and you knew from the style of the watch that it was produced during the 1970's, you would be able to tell that it was made in April 1976.The last two digits of the serial number (shown at the bottom of the dial) on watches manufactured from around 1963 to 1993 indicate the year of manufacture.
Sadly, I didn't keep a record of where it all came from, but none of it is my own work. I can't vouch for the accuracy of any of this information, but I've found it useful as a first step in estimating dates of manufacture for some of the watches in my collection.
Airman 1 with Felsa 692 "Bidynator" 23-jewel: 1953-1960 Airman 1 with A. Schild 1701 17-jewel: 1960-1967 Airman 1 and SST with A.
Schild 1903 25-jewel: 1967-1971 Airman 1 and SST with A.
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If the serial number was 60498135 for example and you knew from the style of the watch that it was produced during the 1970's, you would be able to tell that it was made in April 1976.
So, you need prior knowledge of the decade in which the watch was manufactured before you can date it accurately with the serial number.