Date code on case back is M7 under serial number
date code on movement is M7
Dial face is different than others I have seen wondering if dial is a replacement
Inside case back is scribed - 5 [triangle] KH68
I have lightly cleaned this watch but not the movement (I am not a watch guy.) I did lightly remove, with a brush, what appeared to be old adhesive from around dial indiacators and Bulova badge.