Not a roughback #10-3", but they usually have an unfinished side, occuring from the leather being folded. This leaves the unfinished side exposed. The "pouch" sheaths were started, pretty much, after the Johnson era, as were the "drop points". There is, more than likely, some crossover timing, but your knife (Fl. Blade stamp) and a tan pouch is screaming early 90's to me. Hope this helps.
Best, capt. Chris