Sorry for missing this until now Tyson, I'm busier than usual at the moment. Geoff Tweedale was originally planning to publish a third edition of his invaluable book on Sheffield cutlery manufacturers, but since his earlier edition was already being used as a basis for the Sheffield Museums resource, he has taken his research there. Hence, the similarities. Geoff had been wanting to turn his book into a free online resource, for some time, anyway.
West Street, and the adjacent street, Trippet Lane, were originally on the edge of the town of Sheffield, but West Street later became an important thoroughfare. Some of the buildings where Wright Brothers are listed date back hundreds of years, and even a few decades ago, there was a maze of alley ways going between West Street and Trippet Lane, with a few larger cutlery firms, and a lot of small cutlery workshops. Being old buildings, with few facilities, and grime-covered windows, they were let out cheaply, with some cutlers also sub-letting parts of their workshop. There was a famous small cutlery shop, Morton's, at 100 West Street, which was the last of the oldest buildings, and upstairs, as well as stock rooms, there were small workshops. Stan Shaw worked in one of them for a while, for a couple of hours, several evenings a week, after finishing work at Ibberson's. I remember seeing into the top level workshop, which was the largest, in 1980. and it was like going back in time 100 years. My father remarked how lucky we were that those dangerous, and filthy old workshops were now gone, but there were plenty like that in the city, still in use. Since most cutlers were self-employed, they weren't covered by the Health & Safety at Work or Factories Acts, and many of these place were unknown to either government inspector or tax man anyway. Many firms. or partnerships, didn't last long, and are consequently obscure. Lots of them will have no record of their existence whatsoever. I think I know where Wright Brothers premises would have been, though I do not recall the company. It may be, that like other firms, they were situated behind West Street, rather than on it, sharing a door, with mail-boxes, with other businesses. This is quite common even today, and in this case, I don't think all the alley-ways were even formally named. I do recall a small cutlery shop also, which fronted West Street in this period, and it may be that Wright's, like numerous 'cutlers', did not actually manufacture, but simply sold knives made by the numerous other small cutlery set-ups. I did go in the shop a couple of times in 1979, but Morton's was much more interesting, and I can't really remember what they sold. The Anglo Works of Walter Trickett sat between West Street and Trippet Lane, but had an independent entrance. Unfortunately, it is now surrounded by modern buildings, but at least as late as the mid 1990's, there was an alley-way (called jennels in Sheffield) next to it, going behind some older buildings fronting onto West Street, and behind it, with lanes leading back onto West Street, between older premises, and running all the way up behind the street, almost as far up as Morton's, with at least 2 more alley-ways going down to Trippet Lane, one of which forked in two.
In the photo below, the alley-way emerged onto Trippet Lane, to the right of Anglo Works, but has now been 'patched' with a modern building, which I think is now part of the bar and music venue called 'Maggie May's).
This was originally a separate factory, which had yet another jennel running behind it, with entrances on both sides, if I remember correctly.
I actually packed your knife away several months ago Tyson, but it looks to be what I have heard Sheffield cutlers call 'Ivorine', which was used for both pocket knives, and table cutlery. It is worth noting that when Sheffield cutlers use a term like that though, they may not be referring precisely to the same material, just something similar. Ivorine is trademarked, and made of cellulose I think, which I don't think that is.
I don't think there's a connection to A. Wright & Sons. This is the only example I've come across from Wright Brothers.
Jack Black
recently gave me this Wright Bros. knife (thanks again!), and I would like to find out anything more about this maker. Jack mentioned that this is the only knife from this maker that he owned, and shared this link (which was the only relevant link I could find on Google searching for various combinations of "Wright Bros knife" and "Wright Bros Sheffield" and things like that). The knife pictured at that link looks a lot like this one.
I reckon that's about it John! 
As I'm rarely in Sheffield, at night, these days, I've never actually been in, but I was passing one Saturday afternoon, and they had an all-day Ska event on. I think it gets pretty busy 
I imagine this is them installing some new lightweight machinery in the factory 
