G'day Batimus, The Model 17 was one of the first post-war SB designs. I know of only a few of these 'baby' Supercuts surviving.
They were beautifully over-engineered for a domestic mower size. I guess that's why the production run - a couple of years - was short.
The times changed so quickly, and I have argued on these forums that Scott Bonnar was confronted with a new and emerging market ...
For the first time, power mowing was within the reach of the working classes. The small Supercuts were way-too-expensive, because their design was way-too-expensive to make!
Scott Bonnar quietly retired the 14" and 16" Supercuts as their new domestic reel designs took hold.