File:MI6 concealment device - Signet rings.png

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MI6_concealment_device_-_Signet_rings.png (248 × 124 pixels, file size: 10 KB, MIME type: image/png)

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Description Original caption: "
Some of the many ingenious types of concealing devices prepared for the use of SIS and its agents. Signet rings are of varying shapes and mechanisms. They are primarily intended for the carrying of suicide tablets, but can also be used for small jewels, micro-photographs or messages written on very small pieces of fine paper. [From Left to Right, Type 1:] This type has a screw-on top which must be unscrewed by a turn to the right to reveal the concealed cavity. [Type 2:] The top of this ring is pivoted in one corner, allowing it to be opened by a sliding movement. The concealed cavity is below this sliding lid. [Type 3:] The top of this ring has a single pivot in one corner allowing it to be opened by a sliding movement. A miniature compass is concealed in the cavity thus revealed. [Type 4:] The top of this ring has an inlaid stone or jewel. This has to be prised out to reveal the concealed cavity beneath.
"
Date 1940s
Source

This file is obtained from the following book:

Keith Jeffery, (2010). MI6: The History of the Secret Intelligence Service 1909-1949, A&C Black.
Author MI6

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Public domain
This work created by the United Kingdom Government is in the public domain.

This is because it is one of the following:

  1. It is a photograph taken prior to 1 June 1957; or
  2. It was published prior to 1974; or
  3. It is an artistic work other than a photograph or engraving (e.g. a painting) which was created prior to 1974.

HMSO has declared that the expiry of Crown Copyrights applies worldwide (ref: HMSO Email Reply)
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See also Copyright and Crown copyright artistic works.

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