Seems as though it may have seen a little filing already. You could also file the blade back to bring the point lower. Have to make it a gradual cut though, you don't just want an abrupt drop. If you need help at it feel free to shoot me a PM.
Just an additional thought on your fine old knife: If you file the kick on the main blade, the nail nick may be below the secondary blade. That kick might also have to be filed just a tad to keep the main blade accessible. Treefarmer
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