The time of handcoloring would only be a guess. The original was not colored, so sometime after it appeared. It could have been done by a group of professionals who were doing this, and may still be doing it. I knew of them in the late 70's but they may have doing it for longer.(I recall that they would even do a number of them and send them to dealers, to sell for them on spec) Usually they are done with watercolors and/or pencil. Most I have seen are very well done and certainly look nice framed. My own preference is for the original without the coloring, but I fully see the interest in colored ones.
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