This Rotomo bill of sale is up on eBay at the moment, and has some interesting info on it:

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It's a little hard to read, but states a sale date of 15/9/1956 for a Victa 18" Rotomo with serial No. 38952 and a sale price of 49 pounds 18 shillings. That serial is a little later than I was expecting, but helps pinpoint a date/serial correlation quite well.

Last edited by unkiemonk; 06/08/13 06:34 PM.