I never understood the popularity of p-38/p-5 (other than one due to sentimental value for ex-army people: that I can understand).
Presumably anyone who is 'equipped' has a SAK/multitool (or both). Any SAK or multitool will do everything p-38 can and more.
So what is the point, just because it's cheap?
well the only reason i carry it, is because it's a better can opener and allows me to make better soda can stoves with. The SAK for everything else.
The difference between the coughlans and the original P-51 are the two lines that are pressed in to the metal. This gives the metal more stiffness. So you won't bent it as easily.