Grinding the original finish off tools, and meticulously enhancing a logo on a well-preserved tool, the way a professional conservator might restore a heraldry symbol on an heirloom chair arm cap that has worn with use and age, are not the same thing. Beyond merely conserving the original materials, professional conservators working for some of our finest public and private institutions often repair and complete worn, broken or missing components of antiquities, when their reconstitution is critical to the piece and its overall purpose. And reconstitution is the technical, professional word for it.
I would never dream of touching a vintage tool with a grinder for de-rusting, and I would never even think about completing all the logos on all of my tools that are worn with an engraver, as a regular practice, which seems crass in the extreme. That should go without saying.
If I had a special hammer with special logo that I planned to frame and display, some kind of keepsake or connection thing, and the logo was central to my purpose, but worn, I wouldn't hesitate to re-constitute the logo or hire a professional to do so. Especially if it was easy to do without corrupting the originality of the piece. Like the lines in a snail outline. Or some of the lettering and parts of the anvil below, for example. If the OP was asking for advice on how to treat all his vintage tools, generally, as a practice, if he even has any other vintage tools, that would be different. I am sympathetic to the idea, circumstantially, which, again, does have a place in the conservation world.
Just in case you guys thought I had been possessed or suddenly developed split personality disorder overnight.