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Geoff,
I've put on a scan of a Scott Bonnar Bulletin which shows the Model 48 rotary mower with an S-B 201 engine as well as the Kirby Lauson. I guess your mower is mid to late 1960s. The Model 47 appears on the price list 1-8 -64, but not the Model 48. An S-B price list dated 1-10-71 lists the Model 49, Model 72 and also the Model 35 which continued for a long time, but not the Model 48, which suggests this Model was finished by then.
Regards,
Grant.