Nice piece, its called fork (叉) but mostly referred to as 'Tiger fork' (虎叉). The fork is considered one of the eighteen weapons of Wushu. Mostly worn by villagers in groups to protect against tiger attacks. A common thing in the 18th and 19th century. Most of these with brass washers are 19th century. Sometimes consisting of two pieces. A spike and a crecent shaped double spike on both sides.
They were also used by militia during uprisings in the Qing period.
Peter
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