Very interesting Rob, I'll have to get the other one back to you so that you can show them together

In the meantime, I'll try and find time to take some pics of it today
I can't see TEW ever producing that kind of chart Harry, or even having the ability to do so. It's a shame, it'd be really useful. Apart from anything else, separating the stamps chronologically would be very difficult, to say the least. Their factory was a big one, and there might have been a whole load of stamps in use at the same time, crazy as that sounds. Undoubtedly, they would have also used jobbing cutlers, who were self-employed, working outside the works (like they do with Russell White today), and possibly inside too. Even a small Sheffield firm like Wright's, where production is coordinated, and entirely within one unit, have several tang stamps, and get them mixed up.
I have Rob's first knife here, and it definitely has a Lambsfoot blade. Both blades look unused, or barely used. It's interesting that two knives of the same pattern, probably produced for the same Australian distributor, and within a relatively short time-frame, STILL have different stamps. I imagine that is because the blades weren't produced specifically for that pattern, and that the cutlers just used what they had, or what was brought to their bench. In Sheffield, it's not entirely unfeasible that two knives, produced by the same cutler, at the same time, would have different stamps!
Thanks for the insight Jack, it makes sense that the task of keeping up with stamps and dates used would have been virtually impossible.