The BB--1 was Bridgestone'seconomy version of their CB city bike series. It was introduced in 1992. I'm assuming the 17" dimension is the seller's measurement as Bridgestone literature shows frame sizes in centimetres. Here's a link to the 1992 catalogue, which has geomtery charts for the BB-1. They're even kind enough to include standover heights.
https://sheldonbrown.com/bridgestone/1992/1992.pdf