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Ok, here is what happened.
Testdisk found 2 partitions on the MBR W7 SSD, the Active System partition of 102 GB and the other data partition, which was Primary but not active. However, the size of the second partition was not correct. That partition was actually 112 GB, and testdisk thought that it ...

One thing that I found recommended somewhere was, using partition wizard, to try to extend or shrink the partitions, even if only a little bit. This would cause it to write an updated partition table to disk, which could fix a mixed up disk. So I did this, using both W7 disk management, and again ...

I made a stupid mistake. I accidentally converted an MBR SSD to GPT.
The MBR SSD had two NTFS partitions (and some blank overprovisioned space): one active with W7-64 on it & the other data.
Unsurprisingly, W7 would no longer boot.

So, I took the SSD out, put it in an external enclosure and ...