Hello! I just picked up a Waltham Crescent St. Model 1892, 17 jewel, 18S watch, lever set, in excellent running order. From what I understand, this is one of the movements that started as a "Royal", but was converted by the factory to a "Crescent St." and the factory milled out "Royal" and engraved in "Crescent St." It is SN 7819020. Attached are some photos. The dial is a bit rough, but otherwise it's running great, in a Fahys "guaranteed" case. I'm sure this movement has been discussed ad nauseam in the past, but all of the discussions I found were ancient and the links to related articles were no longer active. Can anyone tell me about how many movements were converted in this way? Thanks in advance for any information!