This question has been asked sooooo many times..
I just don't get it unless..it's a real antique or something
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Maybe a dealer will see who the warranty was issued to....but they're under NO obligation to do so.
Bottom line..(unless antique) what difference does it make..?? - - it's now yours..!!
If it is a transition saw..I can get that..need to know approximate manufacturing date.
Any good dealer should understand and do a "warranty date" check which will put you in the ballpark.
For just "recreational" curiosity..sort of a waste..can't change anything..and it makes no matter generally
because if even you know sale date..you still don't know manufacturing date like you can with Husky.
Some saws sit on a shelf for years...example here...066 dealer sold at cost after 2 years....NO buyers..!!
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You can ask your Stihl dealer to 'run' the serial number...maybe he will...maybe he won't.
J2F