On the bracelet side for the sub I am not worrying too much; at the time bracelets were often sold later or not at all with the watch and that particular model of the jubilee is correct for the period and accompanied many GMTs in the 50's and 60's; but and almost no Subs that is correct but it doesn't really affect it's originality. But you're right if any parts of the originality fails on the sub it's gone from this comparison completely-
And yes you're right the forum seems to go for the 6542 despite the openly disclosed "flaws"-
Thanks a again Jay- great discussion