This list isn't all encompassing, and is in no particular order, however if listed below, and in condition, it should be a superlative shaver. Again, this isn't comprehensive, but it rather a grouping of some of the more common, high quality razors available at flea markets, on eBay and from fellow forum members to look out for.
By and large most very inexpensive razors, or (by and large) any razor made in Pakistan, India or China. Some brands to stay away from Zeepk, Double Arrow, etc. If the razor is not stamped with a brand name, avoid it.