I have really come to like some of the older calendar date watches lately. Here is a small gathering of some date and non date watches. The Gruen and Benrus are my favorites.
The three strapless top to bottom: Alfa, Gruen, Benrus
The strapped right to left: Hamilton (notice how the supposed pro watch person installed the strap incorrectly), Hamilton, Beltex, Benrus
All great watches the three strapless all need to be restored though. The Pan American I got for a song so it was well worth it.