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I've changed the date of the painting from c. 1659-60 to c. 1665 citing Bryant 2003. In Google preview I cannot see if Bryant justifies his date (I cannot see pp.71, 75)). Also using Google Preview I can see that A Corpus of Rembrandt Paintings IV: Self-Portraits (2007) edited by Ernst van de Wetering has c. 1665-1669 (see here). The web site of the Netherlands Institute for Art History (RKD) also has 1665-1669 and mentions that since the 1980s art historians have moved the date from the first to the second half of the 1660s. Aa77zz (talk) 16:56, 31 March 2016 (UTC)
I've changed my mind and have gone with c. 1665-1669 citing the slightly more recent (2005) and more specialized publication by van de Wetering. The date is given here and is discussed here. Aa77zz (talk) 17:50, 31 March 2016 (UTC)