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you could also go for a 40 X 200 mm Belgium Blue Whetstone, it is thin, doesn't cost to much and it is long so you can make longer strokes which should make some difference.

there is also the La...

if you want a fast coticule you should look for one with a pinkish hue or pink dots, that's apparently an indication that it will be fast.

for the rest I thought that the La Dresante and Les...