Thanks to members emmanuelgoldstein, gatorcpa (and me ). If you want to add a link - vintage stuff or instructional videos, not modern promotional films - do it as a reply to this post. I'll then include it in here (with acknowledgement) and delete your post so that the information is kept in one post instead of developing into a thread.
Hamilton's 'How a watch works' 1949:
Wristwatch Cinema: Hamilton’s “How a Watch Works,” 1949 – I Already Have a Watch.
also available here (also in English BTW)
YouTube - Cómo Funciona un Reloj Mecánico
Hamilton's 'What makes a fine watch fine' 1947.
Wristwatch Cinema: Hamilton’s “What Makes a Fine Watch Fine”, 1947 – I Already Have a Watch.
Member radger's video showing an English spring detent escapement about 1860 and an unsigned, possibly Swiss pivoted detent escapement.
YouTube - chronometers.wmv
Australian Watchmaker at work - 1953 newsreel:
WATCHES (aka WATCHMAKER) - British Pathe
Short animated film about a watchmaker (funny, yet sad) :
Watchmaker - Video
Tissot Astrolon running:
YouTube - Tissot Autolub in motion
Hand making a PW watch case:
YouTube - V&A Jewellery Gallery - Making a Watchcase
Oiling the anti-shock system:
Under the Loupe/Oiling the Anti-Shock System - Alliance Horlogère
Stems and crowns somewhat blurred instructional video
Watch Repair course Stem and Crowns
Changing a mainspring
YouTube - Mechanical Watch Mainspring
Roamer alarm watch demonstration
YouTube - Armbandwecker Roamer MST 417 Wristalarm Watch
Vulcain Cricket Alarm watch demonstration
YouTube - vulcain cricket
Sekonda ad featuring Ronnie Barker (1980s???):
YouTube - Sekonda russian watch advert
Accurist ads featuring John Cleese - 1978:
YouTube - John Cleese Accurist "Accu-Wrist, Accu-Ankle"
Bulova Accutron ad 1960's
YouTube - Vintage 1960s Bulova Accutron Watch Commercial
Timex ad 1950's (?) (lots more suggested on Youtube once you've got this):
YouTube - Vintage Timex Commercial
Making watch hands - in French.
YouTube - Horlogerie - Le Fabricant d'Aiguilles
Soviet newsreel about the Petrodvorets watch factory (Raketa) 1961
YouTube - Soviet newsreel about watch production
A German casemaker who has made number of videos about casemaking. This is part one - Youtube then shows further episodes. Thanks Erik H.
YouTube - Watchmaking, Casemaking Part 1, Gehäusemachen 1. Teil
First (?) electronic watch - LIP, France. No sound and the first few seconds - about nuclear power - are an editing error (I presume).
ELECTRONIC WATCH - British Pathe
International watch & jewellery fair, London 1958:
NOVELTY WATCHES - British Pathe
Watch collector, London 1944:
Amazing watch inside a coin, plus another neat purse watch. No sound.
Some amazing early watches:
Some more clocks and watches- 1934
Letting down mainspring: