Paint code help for '74 RSR turbo - "1-6-915"

[juicersr]

Been trying to decode the door paint code for the '74 RSR turbo that i had the good fortune to see up close and personal a few weeks ago. Trying to match it's original paint. The code '1-6-915'seems reverse of the order of the numbers on my SC and carrera. Doing a search, and found a code for website for 911 codes http://www.356-911.com/modelinfo/911colours/911colours7173.htm which show a '925' for '73 as silver metallic. Is the '915' in the code simply the '74 version of silver metallic? Were the Turbo RSRs resprayed by the factory from their orignal color to silver once Martini sponsorship had been obtained? Thanks