these flooded ebay a few years ago, i fell into the 'naval dirk' trap myself. mine says 'pure steel' on one side, 'good luck' on the other. i believe they were originally sikh kirpan but were mislabelled and sold by the hundreds. mine has the chain, but i've seen them without, or with wood grip, the pommel may vary as well. the scabbard & decorations are distinctive and common to them tho it may come in other colours. there is a caveat on ebay somewhere that someone here pointed out to me.
mine:
