K1 1912 about 12 left.
K2 1926, George Gilbert Scott design, 224 left. Original red iconic box.
K3 1929 two left and a couple in Portugal.
K4 1930 5 left there was only originally 50.
K5 1933 only a few made with none left.
K6 1936 11,700 left.
K7 never made production two left.
K8 1965 54 left
Kx-100 40,000 left
I think everything before K6 is listed then it’s individual listings.