The SS and double broad arrow means 'Sold out of Service'. The SPS means 'Special Precautions Scheme' which ran during WW2 when .22 and .303 rifles were impressed by the Government for Home Guard training (.22's for practice and .303's for issue). After the war they were offered back to the original owners first. The unclaimed rifles were then sold to the public and got the SS stamp to signify official disposal. A piece of NZ history!
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