This is a scale model constructed by Richard Ryder of the CG 40534, a 40-foot Utility Boat once stationed at USCG Station Chatham.
According to this Coast Guard page , this boat was a Mark IV Steel Twin Screw version of the 40 UTB, likely built in 1954.
Richard completed this model in 2023 and donated it to the collection at Station Chatham. Photos courtesy Richard Ryder. Click on the smaller photos to enlarge them.
Here are a couple photos of CG 40534 in action that I found in this video
James J Dempsey
jjd @ jjd.com