Here is the thread with the vectorized open 6, flat top 3 DWO. I used this to make the roulette red/black used on the 6542. The water slide decals are far too difficult to work with when that small. It's like trying to center an egg noodle. http://www.rwgforum.net/topic/150660-vintage-dwos/page-2?hl=%20overlay
So, I took another member's idea, I don't remember who it was, and I print on clear, self sticking address labels Avery #18660. I size the numbers to 2.04978cm, and print 2 on the label. I know for certain I will mess up one. I print at the photo setting for highest resolution, and size it using a Photo Shop program. Any basic photo program will do. The attached pic is saved in my computer at 3000dpi, which is why it is so big here. Obviously, when sized it becomes more crisp. I paint the blank overlay to the color I want, white, aged, etc., and then the fun begins!
Centering the label on the overlay is a pain, but you can gently pull it off and reposition a few times for correct positioning. I try to apply about half way and judge the position from there. Once centered, the next bit of fun begins. Positioning the finished overlay on the date wheel may take a few attempts before you get it right. I use a spare dial so that the on and off isn't being done with a good dial. Too many things can go wrong, broken dial feet, or messing up the dial face itself. Be certain to secure the dial feet to the movement, clamps on ETA, screws on DG, as that will make the dial move. Been there, done that.
Once you have it set, triple check it! I have experienced 'magical wandering' of date wheels with an overlay. Quickset all around, but then use the hand set a few times to make certain it has not shifted. It's a real pain to think it's all lined up, and find that you have to tear the whole thing down because it is off a bit. Done that too.
In regards to the problem of the date showing "if it is the 7th of the month of the 17th", that is an issue with the dial. The rep manufacturers have done a good thing finally positioning the date window in the correct place for Rolex crystal magnifiers, but they make the window a tad too small. I think it's about 1mm too narrow, and needs to be enlarged to the inside - towards the pinion - using a small file and large testicles. Making my own dials with the decals makes this easier.
As always, better ideas and methods are not only welcome, but garner eternal gratitude!