Looked long and hard to find this one. It finally turned up in a 1965 ad shown as reference in last photo. 1967 Senator "M". Case and movement marked M7.
Linen textured face with numbers at even points, stainless back 17 jewels. Ad is poor quality but clearly depicts a square based texture on face and slight stepped sides. An upgraded version of the early 60's "J" with different hands and a modified face.
If everyone agrees with my ID, it's a first for the database.
In reply to Senator "M" is a good match; by Andersok
I concur, band isn't the same as the ad. The band isn't a scissor, but that isn't entirely out of character for a watch dated 1967. Speidel introduced the Twist-O-Flex band in 1959. The band on this watch is a block print logo Speidel and could very easily pre-date the watch. I'm pretty sure Bulova was using Speidels on some models in the mid 1960's. That being said, I agree it's probably a replacement band, as opposed to an original equipment based on the ad.