The introduction of the w114/w115 chassis occurred in 1968. I guess this was a big introduction to MB as it was the first completely new vehicle in a while. I think they may have made it the start of a new generation of vehicles. Anyway, they celebrated 1968 as a big turning point, so these models were referred to by their year. I guess they were only focusing on the last year of the start date, so they became known as Strich Acht or /8 or Stroke Eight.

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).