Hi, Blaster Bob!
Douglas,
You said that they appeared to be 6-pounders; what are the diameters of the bores?
Are all four cast iron guns identical other than rimbases and sights?
Is that convex square shape on all the gun's trunnion faces?
Were there any marks (numbers, letters) anywhere on any of the cannon?
Well there use to be a tape measure in the truck...measurement was based on my hand over the muzzle and comparing that to how my hand fits my own 6 PDR.
All all four are identical cast guns, The bores as far as I could see are in excellent shape. That convex square, or is it a diamond?, is the only mark found on any of them and is found only on one. It is a clue to there origin, I believe. There is just to much small detail and precision work for these to be replicas.
Douglas,
My opinion matches yours about these guns being the genuine article, but we're kind of back to square one in furthering their identification.
The "Encyclopedia of Civil War Artillery" (which is now contained on the "Robinson's Battery" website) was originally put together by Wayne Stark and Chuck Ten Brink, and it shows a photo of the cannon with the blade front sight that is part of the Oquawka monument identified as a "12-pounder iron field gun, heavy, early unknown pattern."
I have no doubt that the photograph is of one of the cast iron 'Oquawka Monument' cannon, but the question now is; was a mistake made when this web version of Mr. Stark's data was created?
There's not that great a difference between the bore diameter of a 6-pounder and a 12-pounder, so the next time one of us gets there we've got to get an accurate bore measurement.
"12-pounder iron field gun, heavy, early unknown pattern. Several guns of this and similar patterns survive, both with and without rimbases. While almost certainly made prior to 1830, some would have been available to both sides and utilized during the Civil War. Total length, various to 85 inches; Weights vary to 1,800 pounds."