Amongst the first parts of the Shrewsbury factory to be operational were the safe deposit workshops. I suspect that my keys were probably from the earliest ones when the new factory was opened and they were buying in the locks. Around 1933 they were using double bitted keys as per your catalogue. I have a catalogue from around 1928 showing vertical, probably flat keyholes.
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PS there were previous safe deposits from Chatwood such as the 1885 (or perhaps 1905) one in Belgium with a single bitted key plus combo, but the post 1928 ones were modular which is why they were much easier to take apart and dump than a vault. This may explain why we can’t find any anywhere.
Chatwood Safe Deposit