First let me say that although I collect Queen knives, I'm far from being an expert.
All of the Queen 28's that I've seen have been 2 blade knives, a clip main and a pen secondary.
Also, I've never seen a Queen knife of that era, 1983, with Ebony handles (they look like Ebony from your pics).
I don't believe Queen used Ebony on the 28.
It is possible that you have a 28 that has been re-worked into a single blade with replacement handles.
If it is, whoever did it did a nice job.
I checked the Queen website for their 1983 catalog but they don't have a PDF. Just a supplemental sheet of that year.
Also, nothing in their 1982 catalog.
Here's the link should you want to check it out...http://www.queencutlery.com/Historical_Catalogs.html
Having said all that, it is possible that Queen did make a single blade 28 with wood handles but I believe they would have given it a different pattern number, maybe 28a or something like that. They have done that in the past with other patterns.