Based on your hint, 5 spacers on non leather started around 1972 or so. But to me, it looks like it has a Medium Black Center spacer and that would date the knife to late 70's to mid 80's.
So I am guessing post 1972 to mid 80's. That really narrows it down, doesn't it!!!!
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Rod Brown RKS 3846 RKCC CM-123 Whether you think you can or can not, you are right.