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For a strop get the latigo leather - it's the cheapest and works well. Down the road you may decide to try different leather, but leave that for later after you have some experience and may be able...

Any of those last ones would be good. They're all honed by the same person - Lynn, and both sites should provide you with excellent service.
The difference between 5/8 and 6/8 is that 6/8 is a bit...