In the 1966 to 1970 Ithaca catalogues the SKB side by side offereings are 100, 200E and 200E Skeet. By 1971 the 280 with a straight grip is added to the line. In 1972 the 150 was added to the line and gone by 1975. Thru 1977 the line remains 100, 200E, 200E Skeet and 280. I don't have an Ithaca catalogue for 1978. Then in 1979 Ithaca had greatly expanded their SKB line with the 300 and 400 Fields, the 100 and 200 Magnum for 12-gauge 3-inch, the 480 English, and the 400 Skeet. Then by the 1980-1981 Ithaca Catalogue the SKB line is gone. Here are a couple of pages from the 1979 Ithaca Catalogue --