The author of your candlestick is the Bolognese Antonio La Fossa, active from 1802 to 1830.

The object was presumably manufactured between 1802 and 1812, when in Bologna there was no rule for guaranteeing silver.
The other two brands are from 1817, when the previously manufactured silverware was re-punched according to the rules of Cardinal Pacca's edict.
With a little envy
best regards