Old Timer pocketknives made from mismatched parts are rather common on the resale market. I'm confident this is not one-of-a-kind, but I haven't seen one like it before and wanted to share. I don't know if it's an "end of days" knife or not - there was no documentation or paperwork included when I bought it.
A 194OT with an SC503 blade:
Best Wishes,
-Bob
A 194OT with an SC503 blade:

Best Wishes,
-Bob