You may have confused your nomenclature. Miroku made a Model 500 SxS under both the Miroku and Charles Daly brand names. The 101 was an O/U marketed by Winchester and made by Olin Kodensha in Japan. SKB has/had a number of SxS and O/U under their own name, as well as branded for Ithaca and Weatherby. I think the Ithaca 500 was an SKB-built O/U. They are all good, solid guns.