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The first number is the GM part number for the frame which for your 81' is 14041144. Not sure what the 301 means. The rest is build date code, see below.
Duke: What's the title of your reference? I may want to get a copy.[/QUOTE]
The book is "Corvette Restoration guide 1968-1982" by Richard Prince. Very good book as it tells what color parts are painted/plated originally.
Where did your picture come from?