This appears to be a very early loudspeaker product from Leak in 1949, which may not have been very succesful. Leak used this loudspeaker in many of his "live-versus-reproduced" public demonstrations in the UK and USA. From a review of company advertising it appears that Leak speakers were not available during most of the 1950's, so this model may have been subsequently deleted.
The few details for this unit are as follows:
Where are these now??
(Original photo and sales information from an
advertisement in Wireless World, Sept 1950.
Photo enhancement by kVs).