I believe the weapon that you describe is a pistol that belonged to the Royal Hong Kong Police Department. It is probably chambered in caliber .380/200 which is the British equivalent to the .38 Colt New Police cartridge/.38 S&W cartridge. It has a 200 grain bullet and was popular with the British and their colonies supplementing the .380/200 in the Webley and the Enfield British service revolvers.
The value is "what ever you can get for it". I wouldn't take anything for mine.
about 1961
made about 1962
Red wire is Positive in a car battery. If they are not color coded, find which one is not connected to the chassis and this will be positive.
The COIL HAS A POSITIVE AND A NEGATIVE TERMINAL. If you look at the top of the coil, it is generally marked + and - on the top.
On the battery is marked - or +. The red cable is positive and the black is negative.
usually it should, but if it doesn't show then the flat side is negative and the tip is positive, On an automotive battery the larger post is positive +.
look at the coil, it is marked - or +
The value depends on overall condition. It could be anywhere between $300 and $800.
not nato
The positive lead is marked with a red dot or a + symbol.
under the bonnet, its insulated with a plastic cap marked with a plus ++++++++++
On some capacitors, it matters; on others it doesn't. On those where it matters, it's marked. (On some really old ones, the negative is marked "outer foil".)