Note 375-2 — TRANSCRIPT OF A LETTER WHICH THE ADMIRAL OF THE INDIES SENT TO THE NURSE OF PRINCE DON JOHN OF CASTILE
Reading edition
A mark was eight ounces or two-thirds of a Troy pound. Here it is probably the silver mark as a measure of value, which was about $3.25. If the word is used as a measure of weight of gold, it would be about $150.