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.
Please send me a photo of your tray......one of the top and one of the marks on the bottom.
You may need to use the macro function (flower icon) of your camera to get a good clear photo of the marks.
If you cannot get a good photo, then sketch the marks and take a photo of the sketch.
To send photos you may use the "attach" or "add" link or "paper clip" you see on your reply page.
Take your time. You can send the photos any time in the next few days.
Barbour/International Silver have made many trays. I need to see what you have.