Huw Eastwood wrotelooks like its only been me waiting for John (safeman) to comment on this one😛:
Nothing intelligent to add, but a slightly unusual appearance suggests they might’ve been experimenting with different (New)configurations or that its a leftovers or “parts bin special”?
Sorry to nearly disappoint you Huw but you’ve struck my Achilles heel. I confess I have an apathy towards Strong Room Doors.
More ‘leftover’ capstan wheels. This was taken in the Old Ford Tann factory before the war. The picture from the Archive Index is unusual having the full clenching mechanism but not the crane hinge.
The Tannsteel E5 Doors were made in 1934 and 1935, eleven in all.
The other archive photograph of the Tann 750 with the swept door form was installed throughout the basement of De Beers in Charterhouse Street. Paint jobs suffering from passing trolleys of ‘goodies’,
These are the steel 
versions Brian. Best for Tann safes too.
[unknown]