My house was built in 1898 and when recently I posted a photo of some remodeling work I did and also a photo of a nail I removed from the lath. It was 1 1/8th inch long with a beveled tip and small round head. I doubt it's any different from any nail being made today.
I had no idea something this simple would start a war. Several "friends" claimed that they just did not make nails like that in 1898.
Sheesh, a nail is hardly hi-tech and I know those headless nails are hundreds of years old.