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Some days ago a member here asked me if I would make a Black Lung for his Seiko Prospex ... so I started working on the design as the one I already made was for an ETA dial While doing that I realized that I had made a BIG mistake while designing the first version of that dial On almost all the SUB 300 T, including the early Seamasters : - the 5mn marks "touch" the rehaut - there are 1 to 3 tiny marks between the lumed 15mn marks and the rehaut - there are 3 tiny marks between the date window and the rehaut If you look closer at the SUB 300 Black Lung (no T) dials you can notice that there's a tiny gap between rehaut and the 5mn marks so I have modified my design to respect that specificity The second specific point is that on the Gen Black Lung watches (ETA dials) the date window is really close to the rehaut. Considering the internal diameter of the metal chapter on the Seikos (27.72mm) and the dimensions and position of the date window, it is clearly impossible to keep the same design and the date window will be more distant from the rehaut (metal chapter on Seiko's). So there are 2 options : 1 - keep the exact "Black Lung" design and accept that there will be a larger blank part between the black rectangle around the date window and the rehaut 2 - modify a little the design and add 3 tiny printed marks between the black rectangle and the rehaut Below are 2 comparison pics that illustrate those 2 options. Left is a Gen SUB 300 Black Lung dial and right is the design for a NH35 movement. On the NH35 design the black exterior circle shows the size of the Seiko dial (28.55mm) and the orange part shows the part of the dial that will be visible through the metal chapter (of course in real all the surface of the blank dial plate will be painted orange). OPTION 1 - respectful of the original design OPTION 2 - modified to match Seiko's window date position My opinion is that the second option, though less respectful of the original design, would be a better choice as the 3 tiny printed indices on the right of the date window will be less noticable than the "gap" between the date window and the rehaut on the first option. The future owner agrees with me ... plus he thinks the 3 tiny marks on the right of the date window will be a perfect "tell" so people will easily know that the dial is not a genuine one ... so we have decided to go with option 2 which is definitely better balanced. BTW ... I'm a honest guy and I always stand by my work ... So the guy for whom I made the first ETA Black Lung will get a new dial with the new better design ... I have already prepared a blank ETA dial plate and I'll modify the ETA design and print it within a few days ...