Can only be found in 100% condition on Benny if the Courier decides to kill him either during Ring-a-Ding-Ding! or Render Unto Caesar. It may also be pickpocketed from him. However, this weapon cannot be obtained if the Courier has Benny crucified.
Two can be obtained by first pickpocketing Maria from Benny while in The Tops when you first meet him, and then obtaining another from him by several means while he is inside The Fort.
In my opinion, the BHP is a timeless design and its form is quite distinctive when compared to Fallout's 10mm pistols. Also, since I knew we weren't going to implement an M1911-style .45, the BHP-based 9mm design gives an extremely similar aesthetic (so similar that a lot of people assume it IS an M1911) while fitting into the 9mm/10mm/12.7mm semi-auto handgun progression in F:NV.