This helmet was introduced at the same time or shortly after the visorless Mk.1.  This specimen is shown with a H- Type oxygen mask.

As the Mk.1, the Mk.1A consists of an inner fabric helmet ( G-type) and a protective hard shell  with a Mk.2 sliding visor fitted.

In the Swiss Air Force the Mk.1A was used mostly during tests, while conveying Hunters from Great Britain to Switzerland. It was subsequently replaced by the H-5.

  Inner G-Type cloth helmet, H-Type oxygen mask.