Russian site,Wzor has posted the screenshots of post Windows 7 RTM build 7700.The Build string is 7700.0.100122-190 which shows that the build was compiled on 22nd Jan 2010.

Here are the details of the build 7700

MICROSOFT WINDOWS SERVER 2008 R2 POST RTM Build 7700
FILE: 7700.0.100122-1900_x64fre_server_en-us_VL-GRMSXVOL_EN_DVD.iso
SIZE: 3,064,651,776 byte
SHA1: 587076ADBA10F47DB5E59597CBEBB10AB0236741
MD5: 6E9EBB5615CA0E80B1199A12F929178D
CRC: 319B2D13

MICROSOFT WINDOWS 7 POST RTM BUILD 7700
FILE: 7700.0.100122-1900_x64fre_client_en-us-GRMCXFRE_EN_DVD.iso
SIZE: 3,231,166,464 byte
SHA1: C0CB719B781D49B39D8CC93A27F990A366B8E4C7
MD5: EBEB8AEC73339536564D26DB584A9474
CRC: B3F323D6

Here are the screenshots of the builds

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