There are three types of gladii that are accepted for use in the era the Legio VI recreates.  The Fulham, Mainz, and Pompeii types. 

Mainz Blade:

Pompeii Blade:

The Pompeii type is so named because the first examples were found in Pompeii, Italy.  It is believes that the Pompeii type phased out the Mainz style during the middle of the first century AD.   The common length of this type varied from 17 in to 20 in and the common width of about 2 in.

The scabbards were a simple form fitting metal cap on the end of the scabbard ,with another metal sleeve on the top of the scabbard.  These two metal pieces can be simple in design or highly decorated with punched out designs.

What to look for:

There are two Pompeii gladius out there that are readily available to us.  One is made my Deepeeka (AH4211N) and is ready to go right off the shelve.  The other is made by Soul of the Warrior (SW012NH-R), and is ready to go also.  The unique that about the one offerd by Soul of the Warrior is that it comes un-dyed so you can dye it any color you like.

Wearing the Gladius:

For legionary it is proper to wear the gladius on the right.  It is accepted, that with the wearing of the lorica segmentata, a baldric is required to hang the gladius.  There have been no evidence that the baldric had any fasteners of any kind, since it could be slip over the head and shoulder.  Although attempts to identify cavalry harness fasteners as baldric fittings continue, despite the differences in decoration between infantry and cavalry equipment. 

The gladius may also be suspended from it own belt, a second belt.  This was more common with earlier periods and only worn with the lorica hamata.  This belt would have no apron, and could consist of two frogs to suspend the gladius like the pugio or not.  If no frogs were used using leather straps put threw the rings on the scabbard and around the belt would attach the gladius

Only legionary with the rank of Centurion or better wore there gladius on the left. 

Here is what “Roman Military Equipment: From the Punic Wars to the Fall of Rome” by M.C. Bishop & J.C.N. Coulston has to say about the Mainz and Pompeii gladii.

Contrary to popular belief, the term “gladius” can mean any sword and is certainly not specific to short weapons.  The infantry sword underwent an important metamorphosis some time after the middle of the 1^st century AD.  The familiar long-pointed, taper-bladed weapon of the Republic, the so-called gladius Hispaniensis (which survived as the ‘Mainz’ type), was phased out in favor of the parallel-edged, short pointed replacement (the “Pompeii” type).  These two swords are, it has been suggested, symptomatic of a change in the style of Roman fighting.  Examples of the Mainz type sword (so-called because so many examples come from the Rhine at Mainz) and its associated scabbard fittings are found throughout the first half of the century and it was clearly still in use at the time of the invasion of Britain in AD 43.  The blade (excluding tang)vary between 400 mm and 550 mm in length and blade widths taper from something like 54-75 mm to 48-60 mm, with the length of point varying between 96 and 200 mm.  The handle assembly consisted of a handguard, an octagonal-sectioned handgrip usually made from a cow longbone, and then a pommel of slightly flattened ovoid appearance.  The pommel and handguard were often made of wood, as example from Vindonissa show, but could also be of bone or ivory.  These pieces were held onto the tang by a copper-alloy rivet.  The sword from Rheingonheim had a silver plated wooden handle and the rivet originally possessed a ‘small ring from a bronze chain’, recalling a gladiator relief from Rome where the sword is suspended form the gladiator’s wrist by a cord or chain.

The parallel-edged Pompeii type (with blade lengths between 420 and 500 mm and widths between 42 and 55 mm) was named after four examples found at Pompeii with the well-known terminus ante quem of AD 79.  Examples of the weapon and its scabbard-fittings give a rather different distribution by comparison with the Mainz-type sword and one piece of scabbard from Verulamium is dated to before the Boudican revolt (AD 60/1), possibly the earliest  archaeological manifestation of the weapon.  Finds of Pompeii-type scabbard-fittings from Wadden Hill seem to belong to some time before AD 64, although the earlier terminal date for Hod Hill (which has also produced Pompeii-type fittings) has been questioned.  The handle assemblies differ markedly from those of the Mainz-type sword, with the handguard now more pronounced and the pommel resembling a flattened sphere.