I would definitely maintain the mark. Film is used for archival and duplication work in libraries, musea, laboratories, courts and other kind of professional use. It is quite possible that the official specification for the work, being written maybe decades ago, require the mark "safety film" on film and, who knows, some archival usage might be lost for a bureaurocratic formality if the mark is absent.
For the same reason I would clearly specify in all technical documents accompanying any film material that it is actually safety film. Stating the obvious can make a sales difference sometimes.
Fabrizio

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