No idea on the specific model #. It appears older than mine, which is late 80s vintage. That said, it looks pretty similar inside, though yours is hard piped, where mine uses rubber fuel hoses for the air pump and fuel pickup.
I spent some time searching the web and eventually found both operator and service manuals for mine, which have helped immensely when I rebuilt it at its 30 year point, since the hoses had deteriorated with age. Parts have not been too hard to find for mine, and there appears to be a fair amount of interchangeability between brands.
I'm not on my computer, but I'll look tomorrow for some links, as Master was made by DESA, I think, and bought or bankrupted or something, but I do remember spending a little time searching through a bunch of different manuals to find mine. IIRC, there were a couple vendor websites that had good manual libraries. Also, a lot of good gouge on utube.
