RAF H type oxygen mask 4/45 dated with oxygen tube

Rare war time dated H Type oxygen mask complete with tube dated 4/45.Mask & Tube are in very good/excellent condition with no issues, supple with no hardening or splitting, pearl coloured chamois lining shows some usage but with no issues, webbing has no elasticity but once on a head it's not really an issue.The mask is in a size Large, Mic & plug are in good order and i would say it would be very difficult to upgrade.The tube again is in excellent order with no crazing in between the corrugations, and both fitting are attached with twine.price includeds postage to UK mainland only.