4456 ‘0’?

fiveSixteenths

Senior Retro Guru
Have a frame and the Nervex bb is stamped with the four numbers on one side and an ‘o’ or a ‘0’ on the opposite
No other stamps I can find on the dropouts nor anything I can see on the steerer tube
BB has an oil port, has a Phillips axle as part of the assembly and a Williams cottered crankset
Any ideas what this might be?
Frame (22”) in gloopy Hammeriite finish is 1.9 kg so it’s clearly not some gaspipe rubbish
 
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