Two blown double glazing units (seal has broken and condensation within). However, if you take them apart you will have two sheets of 4mm glass and two sheets of 6.4mm laminated glass (see pics).
Dimensions are 1053 x 489mm and 645 x 486mm. Each has one 4mm side and one 6.4mm laminated side.
Two double-glazing units - source of glass! (Beaconsfield HP9)
This offer has been gifted to someone and is no longer available.