I would guess this is from the 90s.  The plastic case is in pretty good condition, not broken, and everything listed as contents is here.  It’s 3 -5/8 by 2-7/8″.

Of course, that massive 1920s-era factory has been knocked down and hauled away like Mr. Peabody’s coal.  Somewhere, I hope, someone thought ahead and kept the big, black-and-white aerial photo of the plant that hung in the conference room (I think.  I’m a little hazy on exactly where I saw it…it was years ago).