M6 on case
M6 on the case. Thought it might have been Clipper B but the dial is different.
I'd say the Sea Flight "P" is a good match.
1967 linebook:

In reply to I'd say the Sea Flight "P"… by Andersok
Thanks for the quick response. It does look like that 1967 Sea Flight P. Could the case back reading M6 not reflect the year model change? Thanks.
1966 Bulova Sea Flight P is spot on Ken, this poor guy has had a tough life!
In reply to 1966 Bulova Sea Flight P is… by Geoff Baker
I really like this watch. It was extremely dirty but was running. I sent it off for a cleaning and a servicing. I think a professional could really bring it back.
1966 Bulova Sea Flight "P "
1966 Bulova Sea Flight "P"
1966 Bulova Sea Flight "P" looks to be a good match