Oh, found another. Local flipper, has about 30 bikes on Craigslist all the time. Listed as 27" bike... but that's both the tires (27") and the seat tube measurement = 68.58cm.
So, not quite your 70cm bike, but plenty tall. Bridgestone 400's used Ishiwata triple-butted 4130 cromoly, I believe.

https://washingtondc.craigslist.org/...645751854.html