Also, if you want something similar in the future, you can do it quite easily with gimp's filters (including g'mic). Let me give you a fast rundown of what I did.
First, using the rule of 3, I calculated how I'd need to blow up the picture to 149% in order for it to be about 1200px high. Then, through g'mic's diffusion upscale filter (in gimp, Filters > G'mic > Repair > Upscale [diffusion]), I blew it up to 149%. As for the parameters, I used something like, 0 smoothness, 0 anisotropy, 10 sharpness, or something along those lines. But you can play with the parameters yourself to make it look like it should whenever you're using that filter.
The result was 1205px high, which was 5 px too much, so I made the image 1200px high through Image > Canvas Size. I made it 1920px wide there too, centering it and making sure the 5px of extra height were taken out were from the top (-5 on the y axis).
That left me with transparent space at the right and left, so I added an alpha channel to the original layer (right click on the layer > add alpha channel) and made a new layer that only occupied half of the image horizontally from the right, positioned under the original layer. I took the color from the top and bottom right of the original layer, and used the gradient tool to fill the new layer with these colors. Then, using a 100px-sized feathered brush, I deleted a bit of the side of the original layer, for added smoothness of merging with the new layer. I then repeated the process for the left side, with a third layer.
Then, to finish it off, I added film grain through Filters > Noise > Add Film Grain. Then I made it grayscale through Image > Mode > Grayscale, and exported it as a png (File > Export as..., and name the file with the .png extension).
And now you know how to do this whenever you wanna make a wallpaper from a smaller, old, B&W, grainy picture.
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