Hi Gary!
I served my time at Sentinel when owned by Rolls Royce Oil Engine Division.
Before R-R bought the plant, various machine tools were made under licence, or as sub contract work, (such as the Swift Lathe)
Back in 1958 -60, the machine tools still being made were Halifax planers and Cri Dan B and E screw cutting machines. (These would cut a 12 inch long 1 inch BSW thread in half a minute, which was awe inspiring high tech stuff in those days!)
Then the machine tool expertise was used to make specialised equipment for machining Compressor Wheels for Gas Turbines, for the R-R factory in Glasgow.
In the Apprentice training school we had a Thiel Universal Mill, (a nice small machine – wish I had one!) which had been made under licence by Sentinel.
So to answer your question, sort of, your machine is likely to date from the early to mid 50s.
It will have started life as a well engineered and built machine, but who knows what has happened to it in the last 60 years. Hopefully not too much abuse!
Howard