This is the information panel in more detail. The product code for this FileStore is AEH35 and this is serial number 410. It seems like a low number but I don't know how many FileStores were made!

It's also significant that this unit is copyrighted 1988, two years after the original FileStore E01. This means that Acorn were still investing in 8-bit product development the year after the launch of the first Archimedes.