SWM hallmarked post war glider pilot wing?

[Tonomachi]

I saw this on the Internet and have never encountered this hallmark before. It looks like one of those surplus store replica wings but the ones you normally come across are hollow backed without any hallmarks. Could this be a legitimate replacement wing worn by a glider pilot who stayed in after the war and into the 1960s?

 

 

[patches]

Wouldn't it still be Sterling if it was made in the 50s-60s?