Hi, Lynda ~ Welcome to the forums.
Pretty piece, I have a weakness for keys - yours was made by Masini Gioielli of Firenze (Florence); not very old, believe it's still in production. They've produced a series of different keys, sold as pendants, keychains, etc. - the official Italian mark is a bit obscured, but it should show their registration number, '197' and the 'FI' abbreviation for Florence. Please see "1968 ~ Present" marks here:
Italian Hallmarks
~Cheryl