My neighbor's parents gifted him the mailbag when he graduated about 20 years or so ago and it was in pretty sad shape when he asked if I could do some repair work. It was a previously refurb'd and slightly modified vintage mailbag. My best guess when researching it appears to be a J. Pederman brand. I started this project at the beginning of March this year and with mostly weekend time to work on it, finally finished it this past week following advise from you more experienced posters in this wonderful community. Unfortunately, I accidentally deleted the hinge manufacturing I did to replace the broken hinges but this video displays the before and after. I used Preservation Solutions Leather Cleaner and Leather Rejuvenator which took me about 16 hours to go over the entire bag. The old fish smell was successfully removed. I replaced some of the rotting thread, reburnished the exterior edges and even used some of the stitching advise found here to help mostly flatten the edges of the edge wave on the flap which developed when the stiffening grime was removed. There's a lot of great advise from this community generously provided to other inquiries for which I'm grateful.
Greg