Hi, the balance of my J.Lecoultre P478 is broken and I need to know if a complete balance of P463 could be fit to a p478 movement .My watchmaker told me that JL have not parts I need.Do you Know which other JL caliber could have complete balance compatibility with my P478'caliber?Thanks to you for yours answers and If you P478 complete balance or a P478 movement I could be interrested.Best regards from France