Hi Jim and Bill,
The 1 and 7 appears slightly larger, has a deeper imprint and has a different font ( I have seen similar 1's and 7's on British blades of early 20th century but not on the forte). Possibly added at a later date to add 100 or more years.
Wilkinson and Mole both used the spine to place their numbers, but, I don't think Wilkinson started this practice until 1854? I am not sure when Mole numbered their blades. I think it was at about the same time. Mole of course was a Birmingham not a London maker.
All the Best
Jeff
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