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A barrel that survived a test.
Also known as: Proof house mark, Barrel proof stamp
The mark struck on a firearm barrel that has withstood a deliberate overload test.
Records that the barrel withstood a proof test at a pressure above its normal working load.
Contexts: History, Public information
Certifies survival of a destructive test rather than an inspection: the piece was deliberately overloaded and did not fail, which is a stronger claim than any examination could make and is why the mark carries weight.
Contexts: History, Public information
Applies to the condition at the time of proof and says nothing about the present state of the piece; nothing here is a statement that a marked firearm is safe.
A proof mark records a past test and is not a statement about present condition or safety.
Contexts: History, Public information
A small struck device — a crown over letters, a sceptre, a shield — applied to the barrel and action, accompanied by marks giving the proof pressure and the calibre.