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Well, a little bird told me there might be a contest this holiday season with a mighty fine custom razor as the first prize.
Enter there, and who knows;)

Honestly, that question is like asking how long is a rope:)

It all depends on what materials are being used, and how much work that went into it.
That can vary widely from razor to razor.

A...

There is always the Library on SRP.

Here's the link to it, it contains web-sites to most of them:

Custom Straight Razors - Straight Razor Place Wiki