Hello Bob. As Huw says, this is a Milner List 2, a safe of fire-resisting quality with a measure of drill-resistance protecting the actual keylock.
Milner did not start numbering their safes until 1889 before which the only number they bore was that of the lock. This number 130619 comes from a period close to 1871.
Interestingly the keyway appears to consist of one vertcal slot whereas almost without exception the profile is of a double slot - one for key entry and the other for withdrawal. This represents Milner’s Patent #405 of 1854 which restricts the movement of the key in order to limit the space in which gunpowder can be applied,
The single keyhole on your safe, if I interpret it correctly, suggests that the lock could be a Milner 6-lever detector lock made by Thos. Turner. This is quite unusual as these locks were superceded by Milner’s patent gunpowder-proof lock made by Hobbs & Co from 1852 to 1872.
Do have the original key? If a Turner it will be a pipe key with 7 steps.
Very interesting.
