I've recently come across this mustard-coloured example, it seems the earlier models share a more tan background colour. I'm not 100% certain the label is correct however, it has no reference to the type of smock (Pattern 1959), the date of manufacturer or any UK MOD property markings (broad arrow). But the maker Cookson & Clegg is known for the later DPM uniforms.
Are there any known replicas of the Pattern 59 smock?
Here are the photos: