What you are calling doubleing on the lettering is quite common, (Actually made by the punches the made the lettering) the reason you do not see the date the same way, is it was added with a differant punch.
As far as the added L, all 1884's have an L on them.
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As far as the added L, all 1884's have an L on them.
So some of the 1864's did not have the L, but after 1864 they all should.
Al