Hello and welcome! My name is Doris.I have been an antiques collector, dealer and appraiser for over 56 years.I will be pleased to help you.
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The sponsors (makers) were Cornelius Saunders & Frank Shepard. Their Chester mark was first registered in 1887.
Your box is made of tortoiseshell. This material is on the "Endangerd Species" list. Since it is over 100 years old, it may not be subject to the international ban on tortoiseshell.
You will need to contact the appropriate authorities if you live in the UK before you can sell.
If you live in the US, the authorities are associated with the US Fish and Wildlife agency.
I used to sell tortoiseshell boxes in my store several years ago but the pieces were over 100 years old. The laws have become more strict since then. I had to have a license to sell it.
If your box is not subject to the international ban, is estimated retail value would be an extraordinary $700-900 assuming only minor flaws and depending on location.
There are still many collectors who still buy tortoiseshell.
A private seller to a dealer or at auction can expect 30-60% of estimated retail value.
I hope I have helped you.
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