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If you use the bulk activity extract API you'll be able to generate a CSV file of the Change Data Value activities, which would include the new value and the old value. If you do some Excel magic you could most likely get all the old values into a column and import them back into Marketo. http://developers.marketo.com/rest-api/bulk-extract/
If it's a simple mixup like you know people with Country=Namibia got the Country=China, you can easily roll that back with the Was Data Value Changed filter.
otherwise, you would have to do some variant of the above.
That was country=China and then changed to country=null. So are we talking about the simple roll or the bulk activity extract API?
If the roll, would you mind showing how to do it?
You can do
Data Value Was Changed: Old Value=China, New Value IS EMPTY
but if it's more complex than that, you need to look at other options. If SFDC is tracking that field, you can also try to use SFDC's power to better identify the problem there and roll it back in SFDC instead.