Hi Cesare,
These are so-called lugged spear heads, 14th/15th c.
The mark obviously was deeply struck, so it has to be the smith's mark struck in the yellow read iron. The star, gear or flowerhead shaped symbol is characteristic of literally hundreds of plain smiths' marks from the early medieval times to at least the 17th century and can be found on arrow heads, matchlock mechanisms and blacksmiths' tongs. Any closer identification would, in my opinion, be just illusionary.
Best,
Michael
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