Mine is a 2012 grabber blue in basecoat/clearcoat. Ford paint code is CI, it's a little darker than the original single stage grabber blue.
1970 in the Mustang. My 1970 Fastback was one of the 70 Grabber Special Value package cars. Came in Grabber Blue. -Matt
Code A for black at least on my Comet GT. ford number 1724-A. Incidentally the Comet GT in code J was Competition Blue. -Matt
To the OP: Grabber Blue and Competition Blue were the same colour, just a different name. It was common practice to give the Mercury colours a more "palatable" name to coincide with the Mercury image. Always go by the Ford paint number or the PPG numbers. In 72, the Ford paint codes all went to alpha-numeric codes (3F for Grabber Blue).
Here's a link I saved from another thread on this forum (sorry, can't remember who) that might be helpful. http://paintref.com/cgi-bin/colorcodedisplay.cgi?manuf=Ford&year=1971&con=my&model=Mercury&rows=50