1965 Engineer After treading the previous threads I will leave it to you guys on the variant if any It isn't real clear in the photo but it is the M5 date code This one is also in White Gold
sorry about the typo on reading lol
Advert does not differentiate variant between yellow and white. I'm going with no variant.
1965 Bulova Engineer
I have the same watch in the database as Engineer "G"

Engineer, tentative with either variant G or H
The "I" is a variant on the case and is yellow gold....doesn't readlly help determine if this is the 'G' or 'H'
Historically I think Yellow comes before white, so following this line of through....
G - Yellow (subject case style)
H - White (subject case style)
I - Yellow (this case style)
Just a thought.
In reply to The "I" is a variant on the by mybulova_admin
I agree Stephen. Like this one.
https://www.mybulova.com/watches/1963-engineer-9027?page=1
Ads all state "G" in yellow OR white. That indicates the "G" is yellow, also available in white (with a different variant letter.)
1965 Bulova Engineer "H"
Seems that indications tend to lean towards an H variant but it doesn't say it anywhere
Verification - "G" is yellow & "H" is white.
1965_LineBook_BAWD0159
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1965 Bulova Engineer "H"