Here is some information from the Sadowsky site.

Sadowsky Guitars is extremely proud to announce the release of the Jim Hall Signature Model Archtop Guitar. The result of 4 years of prototyping and collaborating, the Jim Hall Guitar is designed for the working musician as well as the discriminating collector. Sadowsky Guitars is honored to have this association with the premier jazz guitarist, Jim Hall.

Sadowsky Guitars has maintained and repaired the guitar that James D'Aquisto made for Jim Hall. This guitar has been Jim's main guitar for the last 15 years. Roger and Jim began to collaborate on a Sadowsky model that would be more than just a copy of his D'Aquisto. In addition, Roger and Jim were both committed to the idea that this would have to be a guitar that Jim would personally play, not just endorse. The Sadowsky Jim Hall guitar meets all of Jim's requirements as a player.

After numerous prototypes, Roger continued to refine the guitar by reducing the thickness of the plates to provide a more acoustic response, reducing the depth to control feedback, designing a new ebony tailpiece with a string ground and reworking the neck until if felt just like Jim's D'Aquisto. Special attention was paid to an all nitrocellulose lacquer finish with a distinctive "Jim Hall Sunburst". Incorporating Roger's sense of aesthetics and design, the result is a beautiful looking, feeling and sounding guitar that has been enthusiastically received by Jim.

JIM HALL SIGNATURE MODEL ARCHTOP Frequently Asked Questions: link

See the August 2004 issue of Just Jazz Guitar for an article about the Roger Sadowsky build Jim Hall model guitar.

All pro NY guitarists like Jim Hall and Steve Khan take their guitars to Rodger's shop.

More information available on listing's web site.

We needed an entirely new line. For this enormous task, we called on Greg Bennett, an industry marketing and design veteran of almost 30 years. Greg’s experience in high level marketing positions with the industry’s leading manufacturers and retailers, coupled with a formal design and performance background, made him uniquely qualified. The challenge was to take the majority of credible design or style categories and design product that in effect paid tribute to the original designs while creating a new and unique perspective.

More information available on listing's web site.