There were many older machines with large harps. The height and width of the harp space is part of the database I am compiling. when finished we can run a report/chart. Here are just a couple in my collection..
1872 - Howe C (Long Arm)
1876 - White VS1
1880 - Wheeler Wilson #10 (IMO - The best for quilting, High/Low speed, huge harp, smooth as glass, tremendous punching power)
1885 - Singer VS2 ( IMO the second best on this list)