Serial numbers ran from S194500 in 1959 to S206999 in 1960.S198XXX
Value depends on condition and can range from around $500 to well over 1K in mint.
Take the serial number from the underside of the frames grip butt. You may have to remove the grips to see it. There will be a "K" in the serial number.S&W 17-3 SN 741XX
That said, 17-3's were made from 1967 to 1977.
As far as the rust, it will detract from the value. As far as how much, it depends on how much it bothers a potential buyer.
1986/87.66-2 ser AUN04xx
AYDxxxx = 1987.model 686-1 s/n AYDxxx, 686-3 # BHN5xx and 581 # ABY9xx
ABYxxx = 1983.
CCS is 1998 and the special order number dates it to boxed/shipped on the 124 day of 1998.ccs6349, and special order number 8124?
1989.sn BDU54xx
Jim