Accutron, Stainless, black numbers on plain white face, M7, C30852, date at 3:00.
Thank you
Cool watch, we don't see the overlapping "butterfly lugs" very often. For me, this one is a bit of a puzzle. I find the case, dated 1967 with a calendar movement here, but with a different dial and hands. Serial numbers are really close - C30404 and C30852, No sign of it in the linebooks or ads I was able to find.
Gut feeling (without verification) is that yours is a potential marriage of parts sporting the dial and hands from a newer than 1967 Accutron. Movement may have originally been paired with dial noting the color difference of the date wheel
?
I think your watch might be an Accutron "218". There are 3 versions of the "218" with this case in the linebooks but I haven't found it with this dial yet so I am still looking.
I've found a linebook match for a Accutron Calendar "BW". Not sure about the date wheel color, but that isn't making any difference for me.

In reply to I've found a lineboo match… by mybulova_admin
Wow, well found ad Stephen! Agreed!
Accutron Calendar "BW"
In reply to I've found a lineboo match… by mybulova_admin
Nice linebook find! Looks right to me!! A very nice gift from a friend, Grover must have been a great guy.
1967 Bulova Accutron Calendar "BW"
1967 Bulova Accutron Calendar BW
Thank you Panel Members.
Railroad Approved dial confirmed, originally called The Bulova Accutron Transportation Model.
218-1 (Date confirmed)
John V.
Time & Again