kkt
路When considering whether you want a hesalite crystal and steel back vs. a sapphire crystal and display back, consider that the steel back is the model certified for space missions. The display back model is less resistant to being magnetized and therefore flunks spaceworthiness tests.
Regarding water resistance, the moonwatch is probably okay being caught in the rain or a splash while washing your hands. Just don't go swimming or into the shower with it, and have it checked regularly.
The 3570.50 is not the first Speedmaster, but early models before about 1970 go up very rapidly in price if they're in reasonable condition. They also get harder to buy as parts are more likely to be replaced with incorrect replacements. The numbers like 3570.50 are case reference numbers: they specify the type of case, dial, hands. The serial number is applied to the movement; those are true serial numbers that can be used to identify that individual watch movement. You would have to get the back of the watch opened in order to see it. There are also calibers, which are the model of the movement, and those are also engraved on the inside so you'd need to get it opened to see it.
Regarding water resistance, the moonwatch is probably okay being caught in the rain or a splash while washing your hands. Just don't go swimming or into the shower with it, and have it checked regularly.
The 3570.50 is not the first Speedmaster, but early models before about 1970 go up very rapidly in price if they're in reasonable condition. They also get harder to buy as parts are more likely to be replaced with incorrect replacements. The numbers like 3570.50 are case reference numbers: they specify the type of case, dial, hands. The serial number is applied to the movement; those are true serial numbers that can be used to identify that individual watch movement. You would have to get the back of the watch opened in order to see it. There are also calibers, which are the model of the movement, and those are also engraved on the inside so you'd need to get it opened to see it.
that's got to be worth having????