Karl Burgsmuller ( Burgo ) was not a gunmaker but rather a distributor. I'm not famillar with the .38 Apache, however one firearm that bears his name is the Burgo .22, which happens to be a Rohm RG-10. Rohm also made large caliber handguns (.38 and .357). Is the Apache a Rohm .38. If so. being rare does not equate to valuable. It would be worth no more tha a NIB Rohm .38. Maybe 150 if it is NIB. I don't know if it is a Rohm or not, but I have my suspicions that it is.