I am looking for this font used on an event poster / flyer dated between 1991 - 94

[Dsapphire]

Hi I am hoping someone can help me identify this font exactly if possible. I''ve scanned this image in from a book of printed french rave/ event flyers dated between 1991 and 1994 (so this font will have of course existed during this time and not thereafter). It was quite a small image hence the lack of quality. Ideally I would like to have the entire font family for print and web use if available. But would be great to identify what font this is to start with anyhow. This is a sans serif that I can obviously tell, but it does have some characteristics that are quite unique from what I can see: R', 'S' 'a' and '1' for example.

Thanks in advance for the help!

[Dsapphire]

I do have a feeling this could be Helvetica Roman, but would appreciate another opinion!