Hard question for me to answer - the Time Zone was a high Rg - 2.6+, medium Rg - .044 Diff ball with a PowerKoil 18 coverstock.
This is a look Brunswick has gradually moved away from with their US releases. It is basically a Avalanche solid with a stronger heavy rolling asymmetrical core. (Storm still offers several releases with higher Rg values.)
I had a Time Zone and liked it a lot. When I moved down in weight I replaced it with a Fuze Eliminator which is a medium Rg, medium Diff ball with a low load particle modified PowerKoil 18 coverstock. Lately I have added an Avalanche Solid to complement the Fuze as a control ball.
The thing about the Time Zone was it was all about controlled power.
If you still have your Time Zone I would recommend having it resurfaced. PowerKoil 18 will last for decades with no loss of performance.