Gruen Watch Case #505 5016 35mm Swiss Stainless-Steel Swiss Made - Gold Colored Case New Old Stock (NOS)
Inside watch case diameter: 31.16 mm
Check back regularly for new postings. I have a storage locker full of Gruen NOS watch parts.
In this storage locker, I have Dials, Hands, Crystals, Crowns, Watch Bands - Leather and Stainless-Steel.
If you need something specific, let me know. If I have it, I will post it.
Thanks for looking and have a great day.