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The off in one-off does not, in fact, stem from some corruption of the word of. Rather, this British usage of off typically appears with a number to indicate a quantity of items produced in some manufacturing process. The Oxford English Dictionary, Safire notes, takes this back to a 1934 quotation from the Proceedings of the Institute of British Foundrymen: "A splendid one-off pattern can be swept up in a very little time." Other numbers can fit the bill, as in the O.E.D.'s 1973 example of an advertisement for "Kienzle printers, 6 off, surplus to manufacturing requirements." http://www.nytimes.com/2010/07/04/magazine/04FOB-onlanguage-t.html
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