All about Gruen

[Fred]

Here's one I am unable to identify. Appears to be somewhat later than the Master Book. In blue box (All Star?), which I hope to post separately

[Dietrich]

Ah, yes, I have a few of these as well. So far I have found a couple of advertisements showing it, but none the ads had a name for the watch. Therefore all I can tell is that the advertisements showing it are from 1964 to 1967.