I have one of the 'Zastava, Yugoslavia' M57 variations of the TT-33. It has an elongated grip frame & magazine and holds an extra 7.62mm round. Very well made for a military pistol; the add-on 'safety' needs work or it will fire when you apply the safety (instructions are available on the Internet).
The Zastava has several upgrades from the Russian TT-33, like a captive recoil spring. There are 9mm barrels available for the TT-33 which also fit the Zastava.
I like it.