Cheers, Sandklown and uknownick!
I'm still making headway on the 1975 Quickstart, actually
playing through each season and making adjustments to ballparks, financials, and team designs as I go. In the graphic below, black cells denote a Nihon-Koku Series win.

Some interesting storylines coming out, like Osaka supplanting Tokyo as baseball capital of Japan, and the Kansai Cubs replicating their IRL counterparts' eternal haplessness (they missed the '66 NL pennant on percentage points!). No pennants yet for the Cubs, Gladiators, or Meteors.
The only team change in the 1960s is a regrettable one - the Tokyo Express renaming to the Tokyo Power. The colour scheme is San Diego Chargers-esque, the logo with the lightning bolt is from a Japanese freight locomotive introduced the same year, and the uniforms are intentionally garish. Good thing they turn into the Jaguars within a decade!

The A Set complete ZIP is updated with the Power.
Three more jersey sets coming in the 1970s, then one more in the 1990s, and we're done!