Yeh, that is strange. Everything should work, since you already mentioned most pitfalls.
I would almost suggest that if the engine internals are 'old' and worn, that you might not have enough compression. That would mean to measure compression in each cylinder. On the other hand, your starter motor or battery might be on its last legs. Try charging the battery for a night and/or replace your starter motor. A good 1600 (0,7hp?) starter motor should easily give a quick enough turn to start her up.
Good luck,
Walter
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