Randy, saw your post over on the L.C. site. In my opinion it looks to be a factory replacement set. The numbers look the same. It doesn't look like the old numbers were ground off and new ones put there.
Jim had replied back that this gun was made in early 1916. Maybe something happened to the other barrels. In sending guns back to the factory for new barrels, they were half the cost of the gun, and I'm sure this stayed that way until Hunter Arms was bought out in 1945. These guns, both Specialty and Ideal were still made and so the for-ends could be ordered also.
The difference in the two for-ends would be the checkering, the Specialty should have 20 lpi and the Ideal should have 18 lpi., both would have the banjo style release. If yours has the rectangular release, then it was made/replaced in 1939 when Hunter changed designs over.