Dimensions are well for a small/mid size fishing boat anchor. This morning i went lurk inside the local harbour and i saw one atypical (to me) device together with a classic anchor. I asked an old man what that was and he said: that is also an anchor, only a different type, with four 'unhas' (claws). Then i went to a local sport fishing store and saw some yatch type anchors with four flukes. They have this locker thing in the shaft that, when pulled up, allows the four arms to be folded in, to reduce its volume and agressive form. Question: would it be possible (once in time) for that section in your item shaft be also pulled up, to fold in the arms ? Another question: are the two flukes a separate piece welded to the two arms, or were the arms flattened to form flukes ?
However bizarre your example is, i bet my money on the anchor version