Which is cheaper, the Serica Ref. 5303 Diving Chronometer or the Helgray GMT (Refurbished)?

At MSRP the Helgray GMT (Refurbished) is the cheaper of the two at $150, against $1,768 for the Serica Ref. 5303 Diving Chronometer — a $1,618 gap before any retailer discounting.

Which is bigger, the Serica Ref. 5303 Diving Chronometer or the Helgray GMT (Refurbished)?

The Helgray GMT (Refurbished) wears larger at 42mm versus 39mm for the Serica Ref. 5303 Diving Chronometer — a 3mm difference across the dial.

Which has better water resistance, the Serica Ref. 5303 Diving Chronometer or the Helgray GMT (Refurbished)?

The Serica Ref. 5303 Diving Chronometer is rated to 300m versus 50m for the Helgray GMT (Refurbished).

Which has a longer power reserve, the Serica Ref. 5303 Diving Chronometer or the Helgray GMT (Refurbished)?

The Serica Ref. 5303 Diving Chronometer carries a 42-hour power reserve against 40 hours on the Helgray GMT (Refurbished).

What movement does the Serica Ref. 5303 Diving Chronometer run compared to the Helgray GMT (Refurbished)?

The Serica Ref. 5303 Diving Chronometer runs a automatic caliber (M100 COSC), while the Helgray GMT (Refurbished) runs a quartz (Swiss-Made Ronda 515.24H Strap).

Side by side

Serica Ref. 5303 Diving ChronometervsHelgray GMT (Refurbished)

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

Serica Ref. 5303 Diving Chronometer

5303-1-diving-chronometer

MSRP $1,768

Helgray GMT (Refurbished)

gmt-1

MSRP $150

At a glance

13 of 29 specs differ

Diameter

Ref. 5303 Diving Chronometer39mm

GMT (Refurbished)42mm

Power Reserve

Ref. 5303 Diving Chronometer42h

GMT (Refurbished)40h

Water Resistance

Ref. 5303 Diving Chronometer300m

GMT (Refurbished)50m

MSRP

Ref. 5303 Diving Chronometer$1,768

GMT (Refurbished)$150

Full specifications

Case

5 specs

Crystal & Dial

3 specs

AR Coating

Yes

Inner

Dial Color

Enamel Black

Black

Lume

Super-LumiNova

None

Movement

4 specs

Caliber

M100 COSC

Swiss-Made Ronda 515.24H Strap

Type

Automatic

Quartz

Power Reserve

42h

40h

Complications

COSC

None

Pricing

1 specs

MSRP

$1,768

$150

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