Ant
Here are some of my observations, hopefully others will join in the debate:-
Block (IDB)
Normally the bronze block is associated with later Ratner locks. However Ratner bronze blocks are more open whereas this example is defiantly gunpowder proof. There are examples in the collection of brass blocks that are truly gunpowder proof for both Milner and Ratner. The underside of your block is in the same style as an iron one in the collection clearly marked Ratner on the block. Serial Number 7941 which dates to around 1899. Your lock of course would date to when the company was known as Ratclif & Horner.
I was hoping to see Ratners pivoted bolt blocking device which would have confirmed the lock as a Ratner, I’ve not seen this feature in a Milner ‘B’ lock yet.
Marking
It’s common to find the curved markings on locks and can typically be found on many English examples. Its not easy to hand stamp with curved punches producing an even level incised mark. More likely the punch was set in a press and was used to mark both the keys and the locks. This example, in my opinion was marked in such a way – its even and level. So far I haven’t found a Ratner lock without a serial number although some early marks are very feint.
Conclusion
I’m reasonably confident that your lock is a Ratner, based mainly on the IDB detail, from their very early years.
I will start a thread on HoL to record the minute details of known examples of Ratner locks in the same way as has already been done for the Milner Marks, serial numbers and logos when hopefully our collective knowledge will make things clearer.
