Quench-Finish Harpoon Survival Knife in 1084

This knife was a collaborative effort with my 17yo cousin, who picked the pattern and assisted in profiling and heat-treating over the holidays, for his 18th birthday present. 5.125″ harpoon blade, as-quenched, fully hardened halfway down the tang, then differentially tempered for a super-tough blade, with an edge at ~60HRc. Bolster is brass from the E/V Nautilus original rudder bearing assembly, replaced in 2013.