30' LWL w/full keel. According to the HMfgCo list, #610 built in 1903, slightly narrower and shorter than the Bar Harbor 31 class but wider and deeper than the NY 30 class.
Photo sent to me by Frederique Melingue, who may chime in with comments:
Mimosa III, herreshoff manufacturing company (hmco) hull number 610 was
built in 1903 1904 for Trenor l Park for the price of us$6000.
She was a "one off" boat . Nat Herreshoff developed the design from his
April 1896 half-hull
Model for the 21 foot lwl cock robin by changing the scale from 1/12 to
She is launched June 29 1904.as contacted her principle dimensions were lwl
30ft; beam 10 ft-1 inch; draft 7 feet-3 inches. she was restored in 1995 by