Took a closer look at the photo of Ed's Denim -- that mark is more like "544", which MAY indicate May 1944, or it may have nothing to do with teh date at all. Mea Culpa if that latter posisbility is true.
However, if his IS a later production run, my originla point might holod true -- once the "SD" styled denims were obsoleted out of production, there is no real point in differenciating between them, especially since it is extremely unlikely that those still issued SD would be performing fatigue duties in them.
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