I'm not sure (as mentioned) that you'll find a "manual" for it...
On the Numerich site, there is a parts diagram (schematic) listed. It's under CBC and is also known as a "Brazillian Single Barrel". In my Numerich Catalouge (10+years old) it is only listed under "Brazillian Single Barrel".
hxxp://www.gunpartscorp.com/catalog/Products.aspx?catid=1588 (swap the first xx's for tt's...)
Cleaning of a single shot, hinge action shotgun, is a pretty straightforward affair and, not truly "manufacturer specific" operation. Disassembly may be. I don't know if the schematic provided will be much assitance in the procedure other than a "parts count" for re-assembly....