Can't say I've ever seen that before. My best guess would be that someone cut in the second dovetail at some point due to the original being damaged (filed it out too large) or they wanted to change the sight radius. IIRC the upper barrels on these are grooved like an old rimfire receiver to accept scope rings, so it could be they had a new dovetail cut to move the rear sight foreward to clear a scope rather than remove it.
Often hard to tell the reasoning and thought process behind modifications made by a previous owner.
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