Shotgunlover I lost my Coster shotgun mentioned earlier to under rib rust and when I had my Cogswell an Harrison Konor reblued it unearthed a hole in the solder. Fortunately no rust and I had the rib relaid,so I know where you are coming from. I liked the lack of rib on the old Remington 3200 and there was also a cheaper Laurona over and under 3 inch chambered ideal for wildfowling ,as well as having no mid rib it had a very durable blue finish on the barrels which together made it ideal for salt water wildfowling.
With the historic rivalry between Edinburgh and Glasgow I like the idea of an Edinburgh gunmaker making a Glasgow gun but then the fact it would probably be a round action would even that out perhaps favouring Edinburgh.
Were you intending to engrave and chequer the Dickson yourself?