Honestly, most of the ones I see are indeed Wade and Butchers. I've seen them in 7/8, 8/8, and 9/8. Maybe 6/8 too - not sure.
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I've noticed that they also had a run of 'Fine India Steel' etchings from one manufacturer to another. W&B came out with an etching that said 'You Lather Well I'll Shave Well' and Wostenholm followed with a similar blade (size) etched 'You Lather Well I'll Shave Better'.
Wostenholm etched some of their blades IXL (I excel) and George Allen seeing the popularity of his competitor came out with 'Non XL' to pick up some of the market share. According to Robert Doyle in "Straight Razor Collecting" in the 1840s to 1850s Celebrated, Celebrated Rattler, Celebrated Old Army and Old English were common etchings of various manufacturers.
Some manufactures marked their blades with 'Solely made by', 'The Original', 'The Only True', and such as that. They were all trying to push their wares one against the other. Nothing new under the sun as Solomon said a couple of thousand years ago. :)
No I'm afraid not. If it doesn't have 'England' in the tang stamp it would be pre-1881. IIRC that was the year a treaty required that the country of origin be marked on cutlery. To gauge the era a razor was made prior to that there are nuances of scales and blade that are helpful and shown in Doyle's book.