That's interesting, so it's peened tang with a covering nut.
I wouldn't attempt any firther disassembly if it's not willing.
I don't know a lot about these swords but the M1861 was a long lived pattern (as these late sabres often are) so there is a fairly good chance that the Crown/Coronet and rope mark will be noted on other examples.
Try googling 'Austrian M 1861 Infantry Officers sword' and you should be able to find many dozens if not hundreds to compare with yours. You could get lucky and find the same mark on another.
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