Nate, that looks like a 5. What does the other stem look like? The number should be on both stems.
When I have a hard time reading a stem number, I do a quick pencil or grease pencil rub. I use a piece of thermal transfer cash register receipt paper, lay it over the numbers and rub away. You might be surprised by how easy it makes it to read a number.
WRT the manufacturer, without images of decks, thwarts, rails etc. it's hard to confirm that it is an Old Town. Your attached link is a dead-end so perhaps you could place a few pictures here with your thread.