In the 60s the kit was simply a G-Helmet to carry the M, P or Q mask with th eold Mk 1 bone dome for take-off and landing. It was not normal when they were first issued for read crew to have a visor or visor track fitted. There was no need foreseen as the crew flew in darkness.
Bone domes were probably a fairly recent innovation, Flatus Veteranus can probably give more gen. We certainly had them when flying in the Varsity and Meteor.