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I doubt that you'll use a blade long enough to ever see any rust, and the modern blades are made from coated (usually platinum) stainless steel so they're not as prone to rusting as the old carbon...

Agreed. A Super Speed is the ideal starting point for a vintage DE, IMHO. From this point, you can go milder (Tech, Blue Tip SS), or wilder (open comb, adjustables).

Now you just need to find...

38357

21 shaves, or 21 passes? This sounds like King C's sales pitch back in the day:

http://i944.photobucket.com/albums/ad288/redmonkey120/01-16.jpg

Which changed dramatically to only 3.65...

And thus was invented the acronym "YMMV". ;)

All good advice being given here, especially concerning blade samplers. What razor did you buy? Remember that not all DEs are the same, and many also feel that blade performance will vary depending...