These are my Celestion Ditton 15 XR Speakers
They were made sometime in between 1966 - 1976 so making them roughtly 35 ish years old.
I bought them second hand and they are in imaculat condition with unmarked removable covers, they were ex-recording studio speakers!
The sound the produce is in my words "the dogs bollocks" I have had them for about 7 years now and have not blown them yet.
Info below taken from the Celestion website (link at bottom of page)
Celestion’s design team, fired with the success of the Ditton 10, continued the endless pursuit of ultimate sound quality. Their plans were to incorporate an Auxiliary Bass Radiator (ABR) into the system, this passive unit working in conjunction with the bass speaker to extend and reinforce the lower end of the register.
Resultant of their research and engineering, the Ditton 15 made its appearance during 1966, and confounded the experts with such a low response from a small enclosure. The price was also reasonable, retailing for £28.11.6 a pair.
The Ditton 15 was eagerly sought after by the now stereo conscious public, and became the biggest selling bookshelf loudspeaker of its time.
This system remained in production for over a decade, during which period about 250,000 were made, and continued in production in modified form as the Ditton 15XR with a slightly extended response range.
Please visit the Celestion website.