It would take someone with more knowledge to answer your questions; even the assumption that the (four) dots are not maker's marks but a period fashion symbol ... or both. ´
When i bought my cannons i have made some search and resumed that the four dots were typical marks of 15th century short cannons; something certainly not applicable to those in your sword.
Whether there is a time line linking both, i ignore.
In any case, why don't you show us the whole of your sword ?
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