I'm not sure what you mean by 伦敦金 一手、Could you please provide more context or clarify your question?

If you're referring to London gold, also known as gold trading in London, one hand is not a standard unit of measurement、However, I can tell you that:

* One standard unit of gold trading is typically measured in troy ounces (ozt).
* One troy ounce is equal to 31.1035 grams.
* In the London Bullion Market Association (LBMA) gold market, gold is often traded in units of 400 troy ounces, also known as a bar or gold bar.

If you could provide more context or clarify what you mean by 一手 (which translates to one hand in English), I'd be happy to try and assist you further!