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It's not written on the DVD itself and I don't have the DVD sleeve anymore.

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For which OS X version? Snow Leopard (10.6)? or Lion (10.7)? – Pro Backup Jul 31 '12 at 12:21
This should be printed on the physical DVD :-[. – daniel Azuelos Jan 30 at 18:16
up vote 4 down vote accepted

Not exactly through the DVD as you asked, but Apple provides a list will all the build numbers for the Retail installation disks.

enter image description here

Once you've run the Installer, you could always go to the Apple Menu () and choose About this Installer, which should provide the build number.

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Check the SystemVersion.plist file that is on the Install Media.

Within the install media is the file containing the Build number, it is located at /System/Library/CoreServices/SystemVersion.plist

The string value for the Key ProductBuildVersion is the information you are looking for.

Note: This tip is useful for getting the Build versions on any OS X bootable disk, regardless of install ability.

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