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I have an incandescent black light and may give it a try. I have a large Bosch filter like the W 940 / 1 (or Fram PH-8A?).
It may not be on filters that Bosch had made in the USA, it certainly was on the one they sourced from Mann.
Failing a UV light, you can also find it by shining a light over the top of the filter, so from the side. Even though the printing is transparent, it will sit ever so slightly proud of the surface and you will be able to discern it.
A more recently produced (say 2016) W 917 should also have it.
Please let me know if you need a technical writer in Netherlands. I'll defect instantly. Or Finland, Switzerland, Norway, and so forth. Me and the Volvo 240s!
Now, this wouldn't have anything to do with today, would it? ;-)
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