No expert here, but if a bass is patterned after a specific maker's bass, many makers will use the original maker's name, rightly or wrongly, to identify their instrument. Hawkes Panormo models have large upper bouts, and I imagine some of the modern takes on Panormo have this feature as well. Did Panormo make all of his basses with this feature, or is this just one of his models? I don't know. I also think Panormo patterned basses, and other basses with 22" upper bouts are usually considered 7/8.
Ken Smith at www.smithbassforums.com
would be a good person to ask. If you go to his double basses for sale site, you'll see Panormo and Lott models and Lamy and Tarr originals with large upper bouts.