Thracian Gladiator's helm
Nice images but except for the first Thraex helmet from Pompeji bad references:
This cheap Indian helmet called a Hoplomachus, is actually a bad replica of a late 2nd Century AD Murmillo helmet.
As the Gladiator types of Murmillo, Thraex and Hoplomachus actually used the same helmet designs - which did evolve during the 400+ years of gladiatorial games - the crest form was, in conjunction with weaponary - the main trademark of each galdiator type.
The Murmillo had the angular "fishcrest", the Thraex had the round sloping crest with the griffons head at the front and Hoplomachus a similar rounded crest without the griffon.
The Murmillo replica is quite crude in contrast to the originals and the indian Secutor has much to big eyeholes (trust me, I regularly fight someone wearing that helmet)
The greave you have pictured is Thrakian by the way, but its from about 300 BC and has nothing to to with gladiator greaves.
Here are some pictures of original equipment:
Chieti type (round eyes) Thraex and Pompeji type (bigger grates) Murmillo from Pompeji
Berlin type (2nd Cent. CE in Berlin Museum) Murmillo
Republican or early imperial (100 BC - 50 AD) ?Thaex?
without Visor (Full visors were introduced at about 50 AD)
(the original Cheekpieces are missing)
Pompeji type Murmillo and Retiarius shoulder guards from Pompeji
Short Murmillo/Secutor greaves (worn on the left or shieldarm leg)
and a supposed Hoplomachus Parmula from Pompeji
Provocator helmet and two secutor helmets from Pompeji
Pompeji type Thraex and a pair of high Thraex/Hoplomachus greaves from Pompeji
Supposed gladiator short sword and spear head from Pompeji:
During the Republic Gladiators used Mainz type Galdii, but after the Augustan reforms the weapons were shortened to the size of daggers.
The sword above has a blade of about one foot length and the two other daggers found in the Pompejian galdiator barracks were only a foot in length including the handle.
The above is only a small collection from images I have collected on Flickr, you can find much more pictures of helmets, greaves and weapons as well as reliefs, mosaics and other items showing gladiators here: