John Zwicker, brother of Elkanah, began operation in 1862, in a location adjacent to the present-day town wharf. It is claimed that the yard built a total of 148 vessels, however to date only 51 registration forms have been found for vessels built by John H. Zwicker. One of his vessels was said to be the largest ever constructed in Mahone Bay, the 1200 ton (183 feet) full-rigged ship Kinburn, in 1873. The yard closed in 1906 and was purchased by John McLean in 1917.