I’m open to feedback on usefulness of this thread, because there weren’t Gruen national ad campaigns. But there are a few that might merit mention, just to tie them to an era.
1898
Not running ads? Maybe you’ll get lucky, and a competitor will advertise for you! Hamilton is very proud only 1 in 4 of their railroad watches have been condemned, but there’s one watch with a spotless record…
And a well known jeweler ad, for some eye candy. Since regular production models began with 62000, this should be the 24th made (there was no 62,006, but there were two 62009 movements).