What a unique and scarce nest of four boxes from the Scottish manufacturer: Silray Magic Co. circa 1950s. Silray, run by Jack Silver, specialized in lucite (Perspex) plastic props, and these are a great example of the medium. Not only do these high-quality boxes look great they use an approach that is different to all of the nests of boxes I have seen. They use a variation of the Berg method with the big difference that you can briefly show the bottom of the third box and it appears to be whole. This is accomplished by a clever locking mechanism that traps the smaller box inside precisely at the right location so that it looks like the actual base of the box.
This is the first time I have even seen these boxes and they would look perfect in your collection. Complete with ribbons and key for the outer lock. Highly Recommended for collectors of fine, vintage magic.
(Notice: this is in excellent condition for its age of 70 years. There is a hairline crack that has been glued by a previous owner, but it in no way impacts the effect. It is almost invisible from the outside. See photo for the inside view.)
(Notice: This does not come with any instructions.)