To be honest Ike, and I'll be criticised for this I know, I don't see that as a major problem. The phrase 'one off' was in use. It means, obviously one of ....something. In the diary it's used in conjunction with instance. It's more of a colloquial phrase. When people write surely they tend to write more formally? If it was a phrase used mainly in trade then maybe it was only used by people with experience of trade. Like a cotton merchant. How many private letters have been checked to find this phrase? I'd suggest around 0.0000000something of the ones still in existence in various places from the period.
Just an opinion.
Regards
Herlock
Just an opinion.
Regards
Herlock
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