I am fond of this old Fantom though Toni’s the only one of its ilk I have managed to find anywhere. Shades of Oris super etc. eve has what o believe is the original strap with a funky buckle.
Quite likely in that family, but apparently a no-date caliber, so 6310 or 6325, or something like that. If you look carefully under the balance, the number might be there.