I have a M1917 .45 DA with the Brazillian crest. The frame has been datet to 1918 but the cylinder is ser. # 2082xx. The gun has no US Army markings. Can anyone tell me what year the cylinder is from. As I understand the Brazil models were contracted for in 1937 (that date is in the crest) but how do I have a much earlier frame with a cylinder which must be much later?? It has impport markings under the grip, frame and bbl. match, it is that grayish color, Parkarizing ??