The short answer is probably. The longer answer is that we don't have much supporting information for these records so if your serial number matches and the canoe has open gunwales then that is likely to be what "OG" means. There are also several "SR" notes in that column but it is not obvious what that represented until one of those shows up.
The microfilms of these records are exceptionally bad in some cases. The originals are usually easier to read but not in all cases. The original documents are at the Maine State Museum in Augusta so you can contact them for more information.
Benson