I think i may have a rare bottle of Johnnie Walker

[micca]

Hi I am new around here and have joined to try and get some information on a bottle of Johnnie Walker that I have.
So far all I know about the bottle is:

-is called Johnnie Walker 50th Diageo Anniversary

-it is one of only 380 produced
-it was never for sale, only given to the employees of the Diageo plant on its 50th anniversary
-the bottle is engraved and does not have a label, I will try and add a photo
-the bottle is in perfect condition, sealed and in a white box

I would love to know a little more about the bottle and its contents and possibly the price this would go for.

Any feedback would be appreciated