Prior to 1830, very few furniture makers used screws.
They may even be able to tell you exactly when the bed was purchased.
One of the first steps that you should take to determine the beds age is to check for any labels or identifying marks.
In the nineteenth century, manufacturers began assigning numbers to each new patent.
And, since they were made by hand they won’t be uniform in size.
The earliest screws were fairly short, generally no longer than one half inch and had flat heads.The tips of the screws were blunt and the threads were barely visible.