Double-sided A4 flyer by British Celestion, issued by the Japanese distributor 成川商会 around 1983: on the front - the SL600 flagship on its dedicated stand with the Aerolam aluminium honeycomb cabinet (the same aerospace material that arrived in hi-fi via acoustic engineering) alongside its wood-cabinet sibling SL6, and on the back - the return of Ditton 66 in its Series II form plus two compact economy models Ditton 100 and Ditton 110. Celestion is an old English company (born 1924 in Ipswich) that spent its entire life making drivers and loudspeakers, and the SL600/SL6 was their first move away from classic British speaker building towards laser interferometry and metal-dome tweeters. The flyer carries no prices and the front-page headline is a provocation: “In a blind test it’s basically impossible to guess this size”.