Three Antique Silver Syringes

late 19th century, probably all for opiate use, a silver cased syringe by Evans & Co, with screw -in guard over needle, design registered in 1893, marked'SILVER', 12.1cm long; a Pravez type syringe with two needles, in velvet and silk lined fitted Morocco case, unsigned, unmarked but appears solid silver; a syringe by Dubois with three needles, in velvet and silk lined fitted Morocco case, again appears solid silver, case 7.7cm