Can anyone help with identifying this post top, or perhaps suggest a similar alternative:



The internal chrome coating on the top half of the acrylic sphere is very unusual, I have never seen any others like it...

Since nobody can identify this mystery post top, could anyone hazard a guess as to how the chrome coating would have been applied to the INSIDE of the acrylic sphere at the factory? 

Perhaps a question I would better ask on a ship-in-a-bottle forum? 

 probably the same/similar method to apply the reflective coating to a flood light bulb or one of the coated dome lamps .

Yes, it's like a big crown silver lamp isn't it! Probably why I like it so much 

 It is rather cool !