Can't be answered without knowing who made it.
Meridan
Sears store brand made for them by Meridan
38 or 357
It is not. .38 Super is developed from .38 ACP and is for automatic pistols.
Nobody.
No.
No, there are not, because of the design of the shell casing. However, there is a .38 Super cartridge for semi-autos. <><><> Rather rare, but there are a very few semi-auto pistols in .38 Special. These are target pistols that are tuned to only shoot .38 Special Wadcutter target loads. As said, the design of the cartridge case does not lend itself well to semi-autos.
Which helicopter pilots?
late 1800's to early 1900's
The .38 Special will be a revolver, which fires a rimmed cartridge. The .380 is an automatic pistol cartridge intended for compact semi-auto pistols, and is rimless. It is also a substantially shorter cartridge than the .38 Special.They are two completely different cartridges, that have no resemblance other than having a 3 and 8 in the names. .38 Special is a rimmed cartridge made for revolvers. .380 is a rimless cartridge made for use in automatic pistols. It is shorter, slightly smaller in diameter, and has a lighter weight bullet. The two do not interchange.
No such maker. However, there is a firm called Harrington and Richardson and they did make pistols in 38.
Smith and Wesson (S&W) didn't make 38 special pistols in Spain. It's probably a Llama 38 special pistol, it looks a lot like an S&W. It was probably imported sometime in the 1960's.