Gold Coast, Queensland, Australia - passionfruit capital of the universe!
On a 2nd hand bike, the first thing I'd be doing is taking it to a good bikeshop and getting it checked over to ensure everything is in order. They will probably also be able to answer your question.
"I am never going to flirt with idleness again" - Roy Keane
"We invite everyone to question the entire culture we take for granted." - Manic Street Preachers. My blog. My bike tours. Japan tour page under construction.
As you are aware , Concept cycles are very low end products, cheap and cheerfull as you put it.
If you have concerns about any specific problems with the cycle you have aquired. as ChrisL suggested take it to a L.B.S. and get them to check it over.
Or post your requirments to the mechanics forum , there are plenty of clued up guys here more than willing to give sound advice.
The concept model details you are trying to trace may be rather difficult as these cheap bikes come and go out of production very quickly, as with most products in the low end of the market durability is not there strongest point.