Right, the bobbed hammers should be hard chromed (silver colored). It's hard chromed "spurred" hammers that I haven't seen on 4006. That doesn't mean they're not out there, it simply means that I haven't seen a "spurred" hammer in hard chrome on a 4006. All spurred hammers on a 4006 in original factory configuration that I've seen have been blue/black.

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1st Signal Brigade, RVN '70