The answer to this is probably so simple I will feel stupid.
I have seen a number of 50mm f1.8D lenses advertised with the lettering on the front of the lens painted out " because of the project they have been used on ".Any ideas ? all I can think of is a reflection in a glass window.
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happy to explain
Deutch and Swedish Police speed camera rigs had d70s hard-wired with a Kenko 1.4x convertor and Nikon 50mm 1.8d lens in the systems we built now decommissioning them but all names had to be blanked out so no affiliation to a certain company was never visible.
These lenses have brought so much joy to people