I think it might be a Harrachov weight designed by Milan Metelak. Production number 15/3938
Source From Neuwelt to the Whole World page 412.
A pear was also made.
This is a link to a green one on the board. http://www.glassmessages.com/index.php/topic,35060.msg189864.html#msg189864
In the book it shows a pale pink apple and pear. The photograph appears to show that the apple has no clear casing but the pear does but that might just be the way the photo is taken.