Q: Is there a definition for an independent watchmaker?

A: There is no clear definition.
The term "independent watchmakers" often comes up on webChronos, but there is no clear definition of what constitutes an independent watchmaker. In the past, the term "independent watchmaker" was almost synonymous with watchmakers who belonged to the Académie Horlogère Des Créateurs Indépendants (AHCI), but today, an increasing number of people are considered independent watchmakers even if they are not AHCI members. Roger Smith, a student of George Daniels, is one of today's leading independent watchmakers, but he is not affiliated with AHCI.
AHCI members also include François-Paul Journe and Felix Baumgartner, founders of watch companies, who were originally independent watchmakers, but whose companies have grown so large that not many people would consider them independent watchmakers today.

Regulations for Independent Watchmakers in the Japanese Version of Chronos
However, the term watchmaker can refer not only to a watchmaker but also to a watch manufacturer, so some enthusiasts and media outlets refer to small independent manufacturers as "Independent Watchmakers."
The Japanese edition of Chronos defines an independent watchmaker as follows:
-Operated with independent capital
・ Small size
・Having a movement that reflects the creator's intentions
For these reasons, Chronos Japan considers MB&F and FP Journe to be independent manufacturers, not independent watchmakers.
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http://www.webchronos.net/features/35852/

http://www.webchronos.net/features/35829/
