The Titanium Field Guide

Isotope Old Radium Portugal-UK 650

Archive · used only

The Isotope Old Radium Portugal-UK 650 was a 40 mm bronze field watch with a Swiss Landeron 24 automatic movement. It is no longer made, so this page is a reference for buying one used.

All Isotope watchesField watchesMicrobrandUnder 11 mm thickDisplay back
Material
Bronze
Grade / type
CuSn8 bronze
Water resistance
100 m
Type
Field
Price
– · Limited edition of 65 pieces; sold out, the maker page no longer shows a price
Case diameter
40.0 mm
Thickness
10.1 mm
Lug-to-lug
47 mm
Origin
United Kingdom
Movement
Automatic, self-winding
Caliber
Swiss Landeron 24
Power reserve
40 hours
Complications
Date
Construction
Assembled
Surface treatment
Brushed
Finish technology
Natural finish
Caseback
Titanium (sandblasted, exhibition, painted with the coats of arms of England and Portugal)
Nickel-free
Unconfirmed (bracelet, strap, or clasp hardware not confirmed)
Bracelet / strap
20mm quick-release black Italian calfskin strap with a brushed bronze buckle
Crystal
Anti-reflective sapphire
Display back
Yes
Dial
White enamelled with a black outer minute ring, Arabic numerals with Old Radium Super-LumiNova, date window at 3 o'clock
Dial colours
White
Lume
Old Radium Super-LumiNova
Availability
No longer offered
Status
Sold out (limited edition of 65, with Espiral do Tempo for the Portugal-UK 650 initiative)
Not published
Reference, Weight, Colour, Hardness, Matching bracelet
High confidence Verified Oct 2026 Source: Isotope (maker product page)
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Frequently asked questions

What is the case of the Isotope Old Radium Portugal-UK 650 made of?

The case is cusn8 bronze. That is confirmed against the maker's specification. The caseback is titanium (sandblasted, exhibition, painted with the coats of arms of england and portugal).

What size is the Isotope Old Radium Portugal-UK 650?

The case is 40 mm across, 10.1 mm thick and 47 mm from lug to lug. It is water resistant to 100 m.

How much does the Isotope Old Radium Portugal-UK 650 cost, and is it available?

It is no longer made, so the only way to buy one is used.

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