JaXon China was Jackson China's very early brand, made at its Fall Creek, Penn., plant between 1914 and 1930, according to Jim Strano, author of the book on Jackson. It tends to be large and heavy ware and is very hard to find in anything but white or green-lined decorations. It also tends to be more be more crudely manufactured compared to what I think of as Jackson's usual quality - rustic might be a kinder word!
But JaXon in the hand has incredible appeal precisely because of its heft and plain design. In many ways it exemplifies the strength and durability of restaurant ware, blemishes and all.
The mug is approximately 4 1/2 inches wide, including the handle, by 3 1/2 inches high. It is shown in Jackson's earliest catalog as Underglaze Print Decoration #108. It has heavy wear, some tan discoloration as well as some glaze pops and discoloration inside the mug. Nevertheless, it's quite a beautiful mug and the only example of this pattern I've ever seen.
To explain the backstamp, the JAXON SEVEN refers to the amount of liquid it was made to hold: 7 ounces. The initials J.V.C.C. stand for Jackson Vitrified China Company.