Regarding the Oliver clone, it was probably a "Rustler MK3 Olly" copy. Assembled and sold by Ian Russel in the UK from high quality Russian parts.. Usually about GBP110 or so when available, but a much better proposition than a CS.
No, neither a Rustler nor a CS, but an interesting motor though. Back in the late 80's a fellow called Andrew Kennedy here in Australia decided to try selling Tiger replicas. He had his own Tiger (a Mk2 - I understand that the CS Tiger is a Mk3) copied and replicas produced from it in China, and then sold them around the place. Eventually he got out of the business, as people were buying directly from the Chinese and he was effectively being cut out of the process. Whether this all eventually turned into the CS business I don't know - I'm not aware of the history of the CS motors.
I contacted Andrew - he told me that the engine is of good quality and of equivalent performance to the original Tiger, although in his opinion the Chinese ballrace is a bit ordinary and can be replaced by something better. In any case, it's a really nice motor to start and run, and spins a 9x4 about 1200 rpm faster than my healthy PAW 15DS. A Rothwell or original Tiger is no doubt a cut above it, but it'll do fine for what I need it for.
Cheers
Steve