I started on the next blade this morning. It was a #208. Unfortunately, the razors are "higher quality" as you go up in the numbers. One aspect of this is that the stamping on the shank is done more carefully. MUCH more carefully. In other words, the stamping is VERY DEEP, and it is not practical to grind it out. So, it will never become a Gold Slash. It will remain a Gold Dollar, albeit a modified one. So I think my set will be all pure #66, even if I have to order a couple more. Meanwhile, I am still sanding on the #208 and it will end up being a nice razor. Already has a good voice. Sings nicely without the stabilizers and shoulders. It is a little thinner, too. On the #66 the stamping is not so deep and can be sanded off.
Found a good method of sanding the vestiges of stabilizers off the blade. I make a sanding block contoured to the blade, wrap sanding paper around it, and tape one end.The tape rides on the blade during the sanding stroke, concentrating the pressure and abrasive action on the thickened part of the blade where the stabilizer was. Then, for general sanding once the thickness is faired down to that of the rest of the blade, I remove the tape. Pic when I do the next one.