They are obviously laboratory or pilot plant glassware. These things were possibly made to order so may never be identified. They do date to before 1973 when Jobling was bought out by Corning, the actual owner of the Pyrex trademark and patents. Hence newer UK Pyrex no longer has the JAJ mark. Jobling only ever made Pyrex under licence. We aren't puzzled, it's just there is no more information to be had unless you know where they came from.