7 day sets were not common. They were marketed for the well heeled and often times they were top of the line pieces with fancy ornate scales and fancy boxes. It wasn't something the average Joe would ever acquire.

Most folks owned one or two razors and that was it. Even though you could put together your own 7 day set for less (just like now) once you matched and labeled them and got them in a presentation case the markup was huge. TI had a 7 day set a few years ago, they might still have it. The price will take your breath away.