A Tomistoma egg which, as you can see from the photograph, measures around 100mm lengthways and 65mm widthways. Mass is around 270g.
Egg size varies from clutch to clutch.
Larger crocodiles tend to lay larger clutches which contain larger eggs. Crocodiles breeding for the first time often lay very small clutches, with a high number of infertile or abnormal eggs. Given that this species probably lives between 60 and 80 years, however, they have many opportunities to produce clutches over a lifetime.