Brands
- Alvey
- Alvin
- Alwand Vahan
- Amaral
- Amaral Muñoz
- Amco
- American
- American Express
- American Flyer Lines
- American Silver
- American Watch Co
- Amethyst
- Amita
- Amy Quandelacy
- ANco
- Angus & Coote
- Ansonia
- Antara
- Antique
- Appleton
- Armani Exchange
- Arthur Bond
- Artisan
- Arts and Crafts
- Asch Grossbardt
- Asprey
- Atkin Brothers
- Atocha
- Audemars Piguet
- Australian Collectors Treasury
- authur court
- Autoart