Many thanks, Rob & Peter! Today I set out to crop-up as many images of the 1700 shilling as I could, to see if I could pin-point a typical location for the stop mark.  I found around 15 with which to make a start but, at crop7, I realised I had an exact die-match for my shilling. So...I added transparency to one of the shillings and overlaid it, showing it to be in perfect alignment, and then marked off the stop location before removing the overlaid die-match which, incidently, DID have a stop after DEI.  The indentation on my coin, which falls across the small crack is exactly where there should have been a stop, meaning it's a definite die-block, which probably caused the crack, as well as the concave impression. So, the only question left to answer is this: Is a blocked die the definition of a NO STOP in this instant? ANY information or thoughts would be greatly appreciated! The top image shows the 2 coins overlaid with a circle marking the perimeter of the stop! The middle image is a straight crop of my coin. The bottom image shows the die (with stop) slid down, leaving the circle in position on my coin.