Guys, trying to work out what this could be. Ignore the Martin decal....The only clues I have are the Daion/Yamaki logo on the tuners (which don't appear original), the solid top and laminate sides. There is a '444' on the pickguard, which appears original, but I can find no trace of a model number or make that has 444 in it.
I think it's a 70s Japanese Martin copy, but have nowhere to go anymore.
And as people have asked, tone is good and it's very loud.