The small-seconds Cal 1007/BS and its sibling, the center-seconds Cal 1008/BS are definitely one of my of favorite, vintage, manual-wind, movements from VC. These are the "highest" end of the evolutionary chain for the Cal 453/454 family.
Cal 1007/BS and Cal 1008/BS were the only manual-wind movements ever used in wristwatch Chronometre Royales, which were introduced in the 1950s. As such, besides amazing finishing, they were regulated to operate at a very high standard for accuracy (this was pre-COSC).
Also, this was one of the first movements that had a hacking seconds hand feature in a watch for non-military use (which is what the "/BS" in the calibre numbers name designates, "Balance Stop"). I do not know how hacking seconds mechanisms work in modern watches, but Cal. 1007/BS used such a simple device to implement this feature 60 years ago, that I think its charming when looked at through modern eyes.
You can see the curved metal hook/lever that is on top of the movement and anchored at one pivot point. (It almost covers the escapement wheel's cap jewel). This lever is controlled at one end by pulling the crown out or pushing it back in. At the other end of the lever, there is a tiny, open-ended spring attached to the bottom of the lever.
When the crown is in its normal position, the tiny hairspring is positioned inside the circumference of the balance wheel and does not interfere with anything...therefore the watch operates normally.
But when you pull the crown out, you cause the hook/lever to move around its pivot point, causing the tiny hairspring to move outward and come in physical contact with the balance wheel, thereby stopping the movement creating the hacking seconds feature of the watch!
When it comes to beautiful movement finishing, I LOVE the look of black polishing, especially when it is on one of my very favorite watch components (the swan-neck, micro-regulating system). Black polishing is achieved through polishing a component so fine, smooth and even, that light has no irregularities to reflect back and therefore gives the black/dark appearance.
Here you can see how the swan-neck looks black when compared with the Geneva Waves finishing of the balance cock below that it sits on.