Spam, old school

I just got the classic "I manage a large account owned by a dead person with your name; would you help me empty it out?" letter.  In the physical mail, printed on dead trees.

The postmark says "by air mail / Royal Mail / postage paid GB  Guildford 1060".  Which could easily be bogus, but somehow they got it injected into at least the U.S. postal system (if not the UK postal system), which means it must have cost at least 30c or so, which means they think the average take on this scam will be more than that.