If you have an air compressor reduce the pressure to about ten pounds and blow some air around the void. If a brown powder comes out, the barrels were hot-blued at some time and the solder has dissolved. The extra plugged weep holes indicate a bluing job, maybe more than one, probably plugged with solder (maybe a lead shot peened into the holes). If it is steel then it is probably a screw dressed down. Scratch it to see if it is steel or lead.
But the current finish on the barrels looks to be rust-bluing just looking at the pictures without seeing it in person. If nothing comes out and that is the only spot, shoot it. It could be a void from the factory (Oh My!). See a previous discussion on this. The worst that will happen is it will get worse and the ribs will need to be re-laid and the barrels reblued, costing a good part of the value of the gun. Keep it well oiled to prevent moisture getting in there if that is the only spot.
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