The front plate has a royal crest stamp

and the words

chubbs patent

57 st pauls cyhd

London

chubb & son

makers to her majesty

365909

The lock comes with one key

words on the key are

chubbs patent

57 st pauls cyhd London

This type of lock was made to stop it being opened by picking and gunpowder blast

in 1851 hobbs picked a chubb lock at the great exhibition 

so chubb made this type of lock to stop this from happening again 

this lock was fitted with a extra lever and a barrel and curtain 

the curtain has the words 

4567 mortise

The lock has a extra steel ring to capture the gunpowder when poured in through the keyway

stopping the whole of the inside filling up with powder

then there are holes in the backplate to dissipate the blast

you can see this lock has chubbs standard overlift detector mechanism

and false notches in the levers

The lock has a comb steel spring 

one of the comb spring tooth has broken overtime

there are seven brass levers in this lock

the lock was removed by myself from a single skin safe

made to be bricked into a wall a method used in the old times for fire protection

1861

Queen Victoria was on the throne here in Great Britain

Abraham Lincoln was 16th president of the united states

Napoleon 3rd was emperor of France

this lock and key would be a great asset to any lock collection

but should be in a museum 

Thank you

Bill Gregson MBLI