My new-to-me Cooke Portrait 10.5 inch f4.5 doesn't have any 'Tayor, Taylor & Hobson Ltd' (etc.) engraving on the barrel.

Going by the Cooke Compendium and the excellent Cooke Portrait Lens Serial Numbers thread on this forum the lens dates to around 1920.

From what I've seen TTH like to emblazon their name on the barrel whenever they can, and I've seen lenses that appear to be a similar age / model with engraving, so is this 'right'? Or could it indicate that part of the barrel has been replaced? Or is there another reason?

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Many thanks,
Peter