Holograph notes on the price of tin from Siam
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Siam Tin sell in Holland for 50 Gilders Bank money (i. e. 4li. 5s. 6d) per cwt
Ours for 45 or 56 Current money (i. e. 4li 1s )r 2s 10d)
Siam Tin at Mallacca costs from 35 to 40 Dollars of 4s a Dollar the Bahara of 400lwt Averdupois nat (i. e. from 39s to 44s the cwt)
In China it pays 1 Tale of 6s 8d custome & sells for 10 Tale a Pecol of 132lwt Averdupois
It is often carried from Mallacca to Persia at 60 per cent profit
It is vendible at the Bay at the fort & at Surat
Source
MINT 19/3/533, National Archives, Kew, Richmond, Surrey, UK1705, c. 105 words.