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I think it could be a pre woodsman, the barrel isn't quite right. Cant find a short "Pencil Barrel" but if i could i bet it would look like that.
The picture gets very grainy if you zoom it, but you can clearly see the slide/barrel parting line its something in the Colt Woodsman / High Standard vein. It its a colt it might be a high polish blue (aka royal blue) which could appear silver in the right lighting.
It's not a P38 the top of the slide and the area around the barrel is all wrong for that, plus the aforementioned parting line. Its also not a Luger (not even close) and not a PPK/PPKs with a long barrel.
Guarantee it is a High Standard or Colt Woodsman or clone...