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The stodgy classic guy in me prefers the old tang but another part of me thinks that was a heap of fun :p
Smooth shaving :)

So far so good.... & now the hard part :)

Don't you go resting the edge on those crystals when its honed up :nono::D

That is a considerable jump & it certainly will not shave the same as 11/16. For me 9/16 is more useful as a trimmer but some like the narrower widths.
You would be likely well into the rear...

Don't know that it's a valuable piece.
Before any resto attempt see if it will take an edge.
That patch of corrosion near the centre of the edge (last pic) may be a problem. It appears to be...

+1 for the Golden Nib :tu

Welcome aboard gandrw !
Lottsa learnin' to be had here :) Don't be shy with questions.