Silver Swordfish Ring

I just found this in one of my costume jewellery boxes, and I don't ever remember seeing it in my life before! I don't know how it got in there, where it came from... weird! Looks pretty old, probably casted silver. The 925 is slightly off the edge of it on the inside, there is an odd silver 'clump' on the inside behind the ring. Unfortunately it is too big, doesn't fit on any fingers. But it looks pretty cool! Maybe a souvenir from somewhere?
Would love any ideas as to where it came from! Assuming somewhere near the sea....