Nope. They never show who Robin Masters is, although it is believed to be Higgins. There is never an identity to Robin Masters.
Since this is just one year, there are 52 weeks from May 2011 to May 2012.
It's worth exactly one cent.
212
Higgins is definitely not Robin Masters on Magnum PI. Too much evidence in the episodes indicates that Higgins is just Higgins. Robin Masters is present, though not clearly shown, in at least a few episodes. You can't know that, it was deliberately left open to interpretation. Yes he is. Magnum says so in the last episode when he dies.
Masters - 2012 is rated/received certificates of: Singapore:PG
Five Masters - 2012 was released on: USA: 19 September 2012 (internet)
Kaijudo Rise of the Duel Masters - 2012 was released on: USA: 2 June 2012
The Inbetweeners - 2012 The Masters 1-5 was released on: USA: 17 September 2012 Canada: 7 October 2012
Bubba Watson
The cast of Masters of Money - 2012 includes: Stephanie Flanders as Herself - Presenter
The cast of Master of All Masters - 2012 includes: Raphael Siary as Master
Top Chef Masters - 2009 Thai One On 4-6 was released on: USA: 29 August 2012
Bubba Watson just won the 2012 Masters.
The cast of Five Masters - 2012 includes: Winston Hart as Hunter Joey Sinko as Tom Stanton
Bubba Watson! Information: He cried afterwards He is VERY emotional
Kaijudo Rise of the Duel Masters - 2012 The Taken 1-9 was released on: USA: 28 July 2012