Movement Markings of Movements No 1560 (1565) and 1570 (1575)

[Bell904]

Hi I am new to this forum and have a few questions regarding Rolex GMT 1 reference 1675

1. Movement marking Rolex GMT 1 reference 1675

Until when was the crown logo engraved on the winding rotor of the movement(s) 1560 (1565) and 1570 (1575)?

2. Movement serial numbers

Is there a database in which the movement serial numbers (example D81316) are stored? Does the movement serial numbers give an indication as to when the movement was built and how are the numbers composed?

Thanks for the assistance