What did I buy?

[Steve H. in N.Y.]

Ordered some SMLE parts from Springfield Sporters and decided to spend an extra $3 to find out what they mean by a "Safety Thumb Piece Mk II Stamped". Unusually shaped lever marked "III"-I can't make out the small mark on the other side. Not threaded for a catch. The tag that was tied to it states "Bolt, Locking Mk.II. Rifles No.1" and a stock number BB 7933. A rare war time expedient or just junk?

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