You are talking my language....White Horse Whisky...is a blended grain whisky.....and its what i would call, "The last Resort"...i,m a Single Malt man..but did taste this when i was a young man.but this stuff sends the shivers right through you,..it was common in the 40,s /50,s....but as more and better blends came on the market...it sort of fell out of favour....it was known as a poor mans whisky....even now as i write the mere thought of it sends shiver through me,...Now to your glass,over here in Scotland almost anything that has to do with whisky has some value...and the fact that this glass looks to be in pristine cond...makes it have some value,..i,would say anywhere between £10/15 or perhaps a little more,,