John, I played with it trying to remove the horizontal lines. In case you want to repeat it, this is what I came up with:
1. Open the document, copy the background layer, and name it "compensate".
2. Motion Blur Layer "compensate", Angle: 0 degrees, Distance 4 Pixels. (Just blur out the other fine detail).
3. Filter > Other > High Pass, Radius 1 Pixel. This leaves mainly only the exaggerated streaks.
4. Invert layer "compensate", set Blend mode to Overlay, 44%.
This already looks better, but not ideal. Based on the brightness of the base image, the lines disappear with varying visibility of the "compensate" layer. Therefore we gonna make a layer mask based on the brightness of the base image:
6. Turn the visibility of the layer "compensate" off. Select the Background layer (the original image), load the image as selection (channels) and apply this selection as a layer mask to the layer "compensate".
7. Figure out an optimal gradation curve to completely remove the lines for each brightness level, or alternatively just apply one as shown in the attachment.
Not sure how this will work on the full size image, but it should behave similary. Hope this helps.
Regarding the mood... well, for me it has the charme of something old, of something long gone.
Christian