Information quoted from the US Secret Service Web Site.

Welcome to the 419 Eater: "

4-1-9 Schemes frequently use the following tactics:
An individual or company receives a letter or fax from an alleged 'official' representing a foreign government or agency.
An offer is made to transfer millions of dollars in 'over invoiced contract' funds into your personal bank account.
You are encouraged to travel overseas to complete the transaction.
You are requested to provide blank company letterhead forms, banking account information, telephone/fax numbers.
You receive numerous documents with official looking stamps, seals and logo testifying to the authenticity of the proposal.
Eventually you must provide up-front or advance fees for various taxes, attorney fees, transaction fees or bribes.
Other forms of 4-1-9 schemes include: c.o.d. of goods or services, real estate ventures, purchases of crude oil at reduced prices, beneficiary of a will, recipient of an award and paper currency conversion."