Sorry for being a bit slow today, but Doc J has already given you excellent information, just little for me to add.
Breitling launched the TopTime line in 1964, addressing a younger audience and quite massively targeting women !
Your ref. 2000 is from generation 1, so it bears the serial number inside the caseback, which makes it impossible to exactly date it and tell you which movement is inside, though all are manual winds. Early pieces until the end of 1966 had Venus cal. 188, renamed to Valjoux 7730 after Venus was shut down and the technology moved to Valjoux, 1967 and later it would be the Valjoux 7733, a newer version of the same base movement with some adaptations and a different bridge form; generation 2 had different dials and hands too (and an external serial no.)
these were "waterproof", so theoretically ok to wash your hands with them or walk in light rain - not anymore, please ?
seems ok, but crystals are readily available
not cripplingly expensive, but might take some time to find a decent replacement, your watchmaker will help you.
please do not, find a decent watchmaker and have it serviced; the oils will have run dry years ago, running it for extensive periods of time will damage the movement and that might be "cripplingly expensive" to repair or replace.