^ I'm confused.
You've got a Keystone Drop Forge Company advertisement from 1892
and a Keystone Drop Forge Works stock certificate from 1902
and ITCL has a 1910 Keystrone Drop Forge Works catalog on the site.
So.... which company is which? You've got two different company names:
Two companies, three or four names.
I think that Keystone Drop Forge Works and Keystone Drop Forge Co are the same company - one that was in Philadelphia (at 19th and Clearfield) in 1892 and
1897 and
1901 and 1902, and in Chester as of 1906. References to it seem to stop by the 1930s. I cannot, as of yet, find any evidence that a company called "Keystone Drop Forge Works" or "Keystone Drop Forge Co" existed past then, or that it ever moved anywhere after it was in Chester, PA. This was the company that had a P-in-a-keystone trademark.
In support of the idea that they are the same, I offer a 1909 catalogue page that shows something that appears to be the same as the connecting link from the 1892 ad above. If KDF
Works and KDF
Co are not the same company, then I feel they are so close as to suggest that the company dragged itself down an alley, turned itself inside out, and came back out wearing its own coat.
And there is a second company, which never had "Drop" in the name. That is the Keystone Forging (or Forge) Co. This is the one referenced in the VM bullet:
That year (1895) the Van Alen Company purchased the plant of the Keystone Forge Company, located at Elizabethtown, Lancaster Co., Pa., and moved it to Northumberland [...]. In 1908 the Van Alen Company devoted the entire mill to forge work and the manufacture of nail products [...]. This establishment has been one of the thriving interests of Northumberland throughout its existence, bringing prosperity to owners and employees alike.
According to a 1903 source, the company works in Elizabethtown were bought and
named the "Keystone Forging Co" in 1893. In 1895, they incorporated and moved to Northumberland, and the company has been in Northumberland from 1895 until the present day.
The name "Keystone
Forge Co" appears to be an error that pops up now and then until 1911, which is when the cited bullet was written,
but 1895 references to them as a new company (presumably due to incorporation) use the word Forging, and it's the current name. And this is the company that as late as 1996 was using the K-in-a-diamond-in-a-keystone logo.
The two companies - KDF and KFC, for simplicity's sake - are two different companies. They existed at the same time for a while, as seen
here, but they are distinct, and while they both existed they had about half a state between them.