This is a very rare GPO No25 Urea Formaldehyde thermo-setting materiel the same as the telephone made in the early to mid 1930s (commonly referred to as Bakelite). As you can see this is as near perfect as you will find with no colour fade and still the vibrant apple green. No stress cracks at all and no damage. Inside it is marked TE 9. The line in block is a perfect colour match and has a chip to the bottom and unseen when in assemble.The Bell Set internals are a later GPO No26 model but not the part of value.