1939 Kalamazoo KG-21 Archtop natural

Good condition, 6,5/10, Made in USA (stamped Made in The USA on the back of the headstock which means it was built for export outside the US when it was new), when we first saw this guitar we thought it had been originally sunburst and had later been stripped but inspecting closely we found that the finish is original and is still amber blonde but has turned a bit darker close to the binding probably caused by the plastic looks almost like a light sunburst, we are not sure how common or rare this is as we haven't found any pics of natural KG-21´s but the internet community can most likely help us here, pressed spruce top, 14 3/4inch wide body, mahogany back and sides, these models were made 1935-1943 and according to some sources the difference between the KG-21 and the KG-16 is that the KG-21 has the huge v-neck like this guitar while the KG-16 has the more C-shaped neck, original Kluson Mfg tuners, 3 replaced tuner tips (black), V-neck, natural, the E in the serial means 1939, modern refret with slight fretwear, has a homemade aluminium pickguard bracket and a repaired neck heel to body junction with a piece of aluminium, came to us with a small hole in the lower side