In 2018 I've uploaded this photo of heavily used MV lamps present in OUR-125 fixtures on the platforms of Bytów railway station: https://www.lighting-gallery.net/gallery/displayimage.php?album=2822&pos=112&pid=150220
As nowadays MV lamps are hard to come by due to the ban, this prompted to look at the offer of generic brands of cheap lamps made in China. Bellight lamps were bought and installed. After turning on the horrific truth came out. Though they visually look like corrected MV lamps, actually the supposed phosphor coating turns out to be only a diffusion coating. It doesn't add any red to the spectrum which simply is the same as in uncorrected lamps without any coating. Before buying those lamps no one expected the final effect to be that bad. At least they can be used to simulate a What if? scenario where uncorrected MV lamps lasted in massive numbers a little longer. I don't have exact info about the date of installation of those fixtures (there is a lack of photos made between wartime and the time when those fixtures were already present but if I were to guess, basing on analogy to other places probably in the 60's there were fluorescent fixtures, though I don't have any solid info) but I have reason to believe that they appeared at a point in time when the production of uncorrected lamps was discontinued. Therefore corrected lamps were probably present already during the installation of those fixtures and if in old times uncorrected lamps appeared there at all (it's quite probable that uncorrected lamps were never here before) then probably there were only singles recovered from some old stock.