Date: Tuesday, August 16, 1796
Paper: Philadelphia Gazette (Philadelphia, PA) --obtained on GenealogyBank.com.
This item from 1796 indicates that William Bell and Hector Calbraith are selling a three story brick house and lot on Chestnut Street in Philadelphia. The property is where James Calbraith and company have done business for many years. There's no indication of the relationship among the two Calbraiths and Bell, but it would be reasonable that the Calbraith men are somehow related.
Property records may provide more information. In 1794, apparently Hector Calbraith is in Savannah, Georgia, where he is settling up an estate. The name is uncommon enough that it is reasonable to theorize that it may be the same person. Of course "same name" does not mean "same man." Records of the estate settlement in Georgia and property deeds in Philadelphia may indicate additional details about Hector to determine if the men are the same.
It is worth noting that in the 1794 reference, Hector in Georgia is indicating he is leaving the state.
More searches for Hector on GenealogyBank.com may locate additional references.