Hi there! Thanks for the photos of your Gilbey's Spey-Royal. We will see if we can have it dated for you.
I don't have much information in regard to Spey-Royal in particular, however, Glen Spey contributes to the Spey-Royal blend. W & A Gilbey Ltd., of London purchased the "Glen Spey-Glenlivet Distillery" in 1887 (along with Strathmill and Knockando distilleries.) Glen Spey is a key contributor to J&B Rare (the most popular Scotch whisky in Europe and the number two Scotch in the world). Also, just to note, today the Glen Spey distillery is part of Diageo plc.
More info here: http://whisky.com/brands/glen_spey_brand.html