At one time about ninety paintings were considered to be Rembrandt self-portraits, but it is now known that he had his students copy his own self-portraits as part of their training. Modern scholarship has reduced the actual self-portrait count to approximately forty paintings, as well as a few drawings and thirty-one etchings.
Rembrandt's earliest signatures (ca. 1625) consisted of an initial "R", or the monogram "RH" (for Rembrant Harmenszoon), and starting in 1629, "RHL" (the "L" stood, presumably, for Leiden). In 1632, he used this monogram early in the year, then added his family name to it, "RHL-van Rijn", but replaced this form in that same year and began using his first name alone with its original spelling, "Rembrant". In 1633 he added a "d", and maintained this form consistently from that time forward.