I looked on 'another' forum that has etimated dates and the S266000 range shows late '66 to early '67 so it may have come with those diamond targets.

All the ones that my dept had came with targets but no one remembers if the dealer put them on or they shipped that way. I bought one that had worn out diamond targets that were 10 years too early for the gun. (No they didn't keep the boxes. And I thought they never threw anything away.)

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Romans 13:3 & 4