Rare Gab hi-lo adjustable absorber sighted~

After mango done his alignment at Pony's place, i went all the way to the end of the street where Poon Motor is shifting into his new premises. 

While i dig through his pile of blocks+parts, i saw some unusual thing stuck-ing out under the pile. It was a old GAB adjustable (Japan's GAB suspension company, Wings Co. close down in 2002 so GAB had stop production since) 

It's all the same as any GAB japan adjustable but with a special bolt on top of it's soft-hard adjuster. 
it's a gas (nitrogen only please~ dun pump normal air) inlet which had similar inlet head as we use for out tyre tube. It's a really rare indeed.