The Iguana with the Tongue of Fire (1971)

aka l'Iguana dalla Lingua di Fuoco. When a German diplomat (Anton Diffring) finds the body of a woman in the boot of his Rolls-Royce, a black-gloved assassin strikes again and again, slashing throats and throwing acid in people's faces. Though it's not the best giallo you'll ever see, some cheesy special effects, lots of action, Luigi Pistilli with hilariously-dubbed Irish accent and an unusual Dublin location make this one well worth a look.