You all seem so helpful here,I'm hoping for some.I have an unopened blue bottle of chivas royal salute.Has tax seal across top of bottle.No's on seal 1-549 541527574.Bottom of bottle has Spode 75cl.Also has 2506402 on silver lable around top of bottle.It is 4/5 qt.Any way to date it by tax seal?Or any idea of value or how to sell it?Thanks so much!