For more information, please visit this site: Fender Support kcbuck So...
Electronic components such as transformers, potentiometers, speakers, and some capacitors are often stamped with a date code, which indicates the manufacturer and the manufacturing date.
All Fender amplifiers manufactured from 1990 to the present include a date code, printed on the quality assurance (QA) sticker on the back of the amp chassis.
This black-and-silver sticker contains several lines for “sign-offs” on completion of sound and electrical testing.
If you see any data that is not listed here or notice any errors, for 1970’s and earlier Fender amps, please send us an email and we will update the chart.
Oddlings – Yet another printing error has surfaced, this time from the FEI (pre-CBS) days.
Dating early Fender amplifiers is sometimes quite challenging.While dating Fender amps made before 1994 by serial number is all but impossible (as records of these numbers were never kept), all hope is not lost—the charts below should prove helpful in dating your Fender amp.First, it will be useful to you to understand the following five terms in order to choose the correct chart for dating your amp: refers to the two-tone woven fabric that covered many early amplifiers.There are other ways but the above is a more accurate method.Per Blue Book and Fender Consumer Relations Department. By entering this site you declare you read and agreed to its Terms, Rules & Privacy and you understand that your use of the site's content is made at your own risk and responsibility.If the number you have (A59871) is the code, then I'd agree it may be a '71, or some of the information I read could also say that it was built in the 17th week of '89 (if you read it backwards for amp models built after the '70s). hank By entering this site you declare you read and agreed to its Terms, Rules & Privacy and you understand that your use of the site's content is made at your own risk and responsibility.