The Bulgari caliber 220 is based on the ETA caliber 2892-A2 automatic watch movement. The movement shown here was found in a Bvlgari Diagono watch here. The caliber has been redecorated by Bulgari, most notably the branded rotor.
The thin 3.6mm caliber 2892-A2 allows for this model to be an overall 10mm tall after casing and crystal is installed.
Not Signed ETA
Neither the ETA logo or 2892-A2 numbers are not stamped on the movement.The engravings on the movement are as follows: