Houghton MS Eng 870 (14) - Rembrandt letter, Rembrandt, 1669 or earlier

From an undated letter (a. L. S. ) from rembrandt hermanszoon van rijn (1606-1669). To [constantijn] huygens (1596-1687). Ms eng 870 (14), houghton library, harvard university. Date: 1669 or earlier.