Nero Lemania stopwatch help

Hi, was just wondering if anyone could give me any information/value on this watch i have acquired, my dad found this on a dump on an ex militarily airfield a few years ago and ever since its been sat in a box in my bedroom. I've been looking on the internet and have only come across this exact stopwatch once (shown in the link below) but have now reached a dead end. It seems to be a Nero Lemania, swiss made, no markings on back. Any info would be helpfull!!
https://www.flickr.com/photos/816399...7603228824583/

they are a pretty standard Nero Lemania stopwatch. Nothing too specialised or odd about a standard 30 minute one.
The GPO issued them (their pattern 2 I believe). The forces too.
But it should be marked.
This one is mine

http://forum.atgvintagewatches.com/g...MG_9197_ol.jpg

A GPO one, marked like this

http://forum.atgvintagewatches.com/g...MG_9199_ol.jpg

This one just happened to be issued on the day I was born in 1969

Dave

Thanks for the help, I noticed on mine that the 60 seconds is red where yours is black. Does that mean there is a difference or is it a generic thing?