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Try searching the old archives for "Jinbao". The consensus seems to be that it's a Chinese tuba and not one of the better made ones.

I'd keep looking...

I think that the Brand name should be 'Jinbao', not 'Jenbao'.

Because 'Jinbao' in Chinese means 'Improvement'.

Although It was really junk...

Chinese stuffs are always junk, you know...

I thought Yamaha makes pretty good tubas, for an Asian brand at least.