I recently had a key made by a locksmith for a ca. 1920 humidor that had some history that justified the cost

Cost was $40, OK due to the history.  But....while the key worked, it was uuuuggggllly.  Plated steel, and he wire brushed it to remove the burrs and removed much of the plating.  I had some brass sheet of the same thickness; clamped them together, scribed onto the sheet.  Used jeweler's saw and Swiss files to make a nice looking version.  

Carey Mitchell