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A straight would provide a smoother shave but may have more resistance during use. Keen and smooth can be very different

There is honing and maintenance. A barbers hone or finishing stone would last forever and unless you damaged the edge you should be good for a long time. The trick is a little regularly. Touch up...

If it's in the classifieds its probably a good razor. Know wapis have been spoken of alot so a search would get info. From a de you only have to learn the razor use and stopping. A shavette is...