I haven't got a clue what you have there as certain things are not making sense
What you have is a kit of components, the two bass/mid drivers, the two tweeters & the standard Kef crossover in a pair of enclosures
I have a feeling that someone has stapled the kit checklist to the back of the enclosures & they are homemade, but probably done pretty well by the look of it
I remember receiving a Kefkit of a pair of B200, crossover & T27 as a 13 year old kid (lucky for some) & you don't get an enclosure - hense the
kit bit
These look even earlier though in all honesty... No-one would sell a commercial set of speakers with "kit" in any part of the equation
E2A:- 1970 says it all... I was 13 in 1979