The Arugo Special watch.It is marked with "ANTIMAGNETIC" on the dial.
Case back 'The underpants design'
The case back of the Arugo Special features the case back design. On the circle around the design is says "ANTIMAGNETIC - SWISS MADE" and inside this peculiar design is says "ELECTRONICALLY TIMED DIAMOND TOOLED".
Dial texture and features
The dial, as you may be able to make out here, as a moulded starburst texture. The indices are arabic numerals. Next to each numeral is a dot of luminescent. For a watch of this age it is most likely to be radium.
The Movement.
You will see this watch is made from brass plates and with a brass (or brass alloy) balance wheel. This is what helps make it ANTIMAGNETIC as they say on the dial and on the case back.
