Pete, I wanted to get the date correct and traceable because I think this thread will eventually be important to some people. We don't yet know how long it took to develop that first 8FH13 Lawn-Boy that went into production in 1954, but the thread helps us zero in on when one popular brand of American rotary mower actually went into production, and what it looked like. Your mower was a huge improvement on that first one, especially in appearance, and to me it looks mighty good for 1956. I can't find a C1208B model number on that list - was it a local NZ model?
I doubt it was local NZ model, I have 3 engine covers 2 x C1208B and 1 X C1202B