Another RTM has been leaked through a chinese source. The string is 7600.16385.win7_rtm.090713-1255 which means it was compiled on 13th of July ’09
Windows 7 Build 6.1.7600.16385 x64
File Name: 7600.16385.090713-1255_x64fre_client_en-us_Retail_Ultimate-GRMCULXFRER_EN_DVD.iso
SHA1: 326327CC2FF9F05379F5058C41BE6BC5E004BAA7
Windows 7 Build 6.1.7600.16385 x86
File Name: 7600.16385.090713-1255_x86fre_client_en-us_Retail_Ultimate-GRMCULFRER_EN_DVD.iso
SHA1: 5395DC4B38F7BDB1E005FF414DEEDFDB16DBF610
Download Build 6.1.7600.16385 x86 and Build 6.1.7600.16385 x64.