Hello in the USA

I have acquired a Fisher fly rod here in the UK . Never come across the make before . It is in a modern style aluminum tube marked ;-

Most popular actions
Fisher
Since 1922
Rod is marked ;,
Sterling by Fisher
FST 46708 9-0" 6/7
Serial number 91092

It is in four sections , with a 6 1/2" grip , 3 1/2" reel seat with one inner tapered nut Guides are two strippers , 8 graduated snakes and a hayfork tip . To me its outstanding feature are the spiggot ferules as per those fitted to Hardy rods when I started fly fishing in 1975 .
It has a great action , slightly softer than "middle tip " , typical of the days before all the big manufacturers decided we needed fast action rods !
I have found an article dated March 7 2007 from which I deduce it was made in the mid 1980,s but it looks much later than that .
Can anybody give me a more specific timescale ?

Many Thanks
Tony Waddington