I too have an Edgware (no second "e") I've had from school days. These were low intermediate clarinets I think, a step up from the student "regents", and quite nicely made. The wood was generally excellent quality, but the key work is nickle plate, not as high quality as the silver-plate of the Imperials, Emperors or 1010s.
Age could be almost anything. Mine was made in 1970 I think, there is a serial number chart here.
Along the way mine has had a replacement bell.. the original cracked and was replaced with a factory B&H bell in the 80s, along with a new B&H case, and I replaced the rather narrow tip stock mouthpiece with a Vandoren B46, and it sounds pretty good to me, considering what a lousy clarinetist I am
Mine plays much nicer for a bit of attention and the judicous use of some ultrasued to quiet down the rather clacky mechanism on the lower joint spatular keys. I should really get it out and play it more often
Considering they are nice enough wooden clarinets, they are really pretty low value. They go on ebay all the time for a song, less than $100 because people are looking for buffets not booseys, but of course you will need to have some work done on an ebay one I suspect. Fully restored Ive seen them for $350.
So now I have a couple of B&S saxes to go with my original B&H clarinet, and they were made barely a stones throw from where my first sax, and Amati Classic, was made. I've come full circle I guess