This is, I think, the Beam design from Webster City, IA. Other images of it are in the Zenith advertisement and the Marquette spec sheet. AMC (Associated Merchandising Corp) was a sourcing company contracted with by the listed independent department stores (competing with Sears/Wards/May Dept Stores/RH Macy) to provide them hardgoods and domestics (and potentially clothing staples). Similar in the grocery industry to Topco.