The Orange Silencer was a limited production model. My understanding is that there were only a few hundred produced. I'll never forget a few years back when I checked my Orange into the Nationals at Reno, the guy took the ball aside, called over his buddies, and they studied it because they had never seen one. I still use my Orange extensively in league.
The primary difference between the Orange and the Blue/Black is that the Orange came with a high factory polish. Other than that it's hard to tell because my Orange is a pin-in (1.5") and my Blue/Black is pin-out (4"), and with different drill patterns react completely different.
However, I've always suspected that the Orange was tweaked to have a slightly higher RG. Anyway, I wish I'd picked up several when they were initially available. The Orange is nice ball.
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