Made of insulated plactic this tumbler is known to have been reproduced. The inserts are NEMS originals and the plastic tumblers are reproductions. To spot a repro you should measure the top lip : it measures 5/8", the repros are smaller. A good looking item anyway. The original was manufactured by Burrite and came also in green (photo courtesy Joe Hilton) and red.

Source: The Beatles Memorabilia Price Guide 3^rd edition