The time keeping ability of the omega Aqua terra 150m has been superb; regardless of wearing pattern it only loses one second per day. This is within international swatch standards.
Case and Dial
By some standards the two most competitive of the Aqua Terra 150m collections come in two major sizes, 41.5mm and 38.5mm, which are available in various cool colors and models. Currently there are 19 models of the Omega master co-axial 41.5mm while there are 14 models of the omega co-axial 38.5mm.
The dial on the Seamaster Aqua Terra 150m species features a three dimensional vertical ribbing with each hand proportionately shorter than the others. This ensures that the second hand overlaps with the harsh marks on the watch for easy readability and the minute hands with an arrow head overlaps the hour hand while the hour markers just sit a little shy of the hour indexes.
White gold they say, is the material used in making the three dials and indexes. Some customers have reported the heavy nature of the Omega Seamaster Aqua Terra 41.5mm but I do think over time regular wearers got used to it. The ideal size model most people say, would be a size 39mm. So if you have a small wrist the Aqua Terra 38.5mm might appeal to you. James Bond wore the Seamester Aqua Terra 38.5mm watch in the move skyfall. The watch in itself is visually appealing, a true master class. The casing reflects light in a variety of ways improving the appearance and look of the watch.
As with most Omega watches the Aqua Terra collection glows in the dark because of the immobilized superluminova on the dial and indexes.
The movement on the steel on leather strap model is a caliber 8500 self-winding movement en-fused with the escapement technology of the master co-axial. Although the steel on steel model has an omega 8507 self winding movement most of the models in the 41.5mm version utilize the caliber 8500 movement.
The caliber 8500 movement was born from the previous caliber 2500D movement which was highly modified from ETA-2892-A2. Some Seamaster Omega planet ocean models still use the caliber 2500D movement. The caliber 8500 vibrates at an optimum frequency of 25,000bph, its 29.0mm in width and 5.5mm height. Most of the movement parts are made with non-magnetic materials, so omega boycotted the need for a magnetic shielding case. Its no wonder the Aqua Terra collection can withstand magnetic fields greater than 1500 gauss.
A little more on the caliber 8500 movement: The traditional lever escapement is designed in such a way that sliding friction is generated anytime energy is released to the balance via contact with the pallet jewels and the escape wheel. The co-axial escapement successfully replaces the sliding friction with radial friction by placing the escape wheel with an additional escape pinion mounted above it co-axially. This results in shorter contact time between he pallet and escape wheel and pinion. The escape arrangement automatically results in less friction and more stability.
The co-axial escapement technology is a distinguishing feature of omega watches from its competitors. A landmark achievement in movement technology.
Master Co-Axial 41.5mm Bracelet
For the steel on steel model of the Aqua Terra collections the bracelet has solid end and screwed-in links. A nicely engraved omega logo is visible at the side of the bracelet.