CF Martin apprenticed with the famous George Stauffer of Vienna from 1811 to 1825. This would explain why some of his early instruments have the headstock and bridge shapes of a Stauffer instrument. Today the company is still located in Nazareth PA which is a little over an hour outside of Philadelphia. The factory is still there and if you ever get a chance to take the tour, you should do it. Lots of history and lots of great technology.
Many players feel that the OM, offers the most versatile combination of features available in a steel-string acoustic guitar. The traditional OOO has a 24.9 scale length and the OM has a longer 25.4” scale length. I can build either model.
The OOO/OM can be made with a spruce top and many different back and side combinations or a very old school looking guitar made from all mahogany. I do still bind the fretboards and the back and sides so my guitars are still trimmed out to a high level.