Bought in England sometime in the 60s. Movement type not known.
a 'CLIPPER' of one kind or another.
I was looking at some previous posts.
I think it could be a Royal Clipper.
It was my grandma's watch. I'm worried it's never been serviced.
It appears it's never been opened.
Unknown
The was once an ad for a 'MIDNIGHT CLIPPER', the Watch case was identical to the 'ROYAL' but with a solid Black Dial - can't find the ad.
I founnd this watch record. There's an ad snippets in that record.

excellent sluething Will, unfortunately it doesn't match Our subject.
The watch did originally have an elastic braclet.
Case dia= 30mm
The 3-6-9-12 are the same as the royal clipper.
Unknown. Damn Bulova don't make it easy do they.
So , is that the final conclusion "unknown"
Until found?