This is my reply. I would take this gentlemans word for anything Queen related
Hi Jan, this display appears to be 1970's era with imitation Winterbottom bone handles. They are common as they made these many years. My estimate on the small folders is $35.00 to $40.00 range and the larger folders a $50.00 to $60.00 range and the straight knives are in the $40.00 to $50.00 range. These are very good user knives as they are 440C blade steel. The sign is the most valuable item and I feel it's in the $75.00 range. There is a display case on ebay right now and has been on for a few weeks and is listed at $100.00 with no takers.
Hope this gives the owner some idea of what to expect.