Don, right you are, a 32 Pdr. The "Pf" marking we have never seen. Pd or Pdr would fit right in with the 32. 1827 is pretty obvious since the Carron Iron Works of Falkirk, Scotland made these popular 'smashers' from 1771 to 1850!! They were sold to many different countries. No. "678" is the foundry number. The marking indicating the weight, 21 * 27 seems a little odd, but we have read of quite a few errors in this area discovered over the years. We are, by no means experts, but the way we understand this weight and measures system, the two places to the left represent how many hundredweights are included in the total weight of the tube. In this case it would be 21 hundredweight or 2100 Lbs. The second place with the asterisk is the number of 'quarter' hundredweights or units of twenty-five Lbs. The third place to the right is for the number of odd pounds left. In the case of the Old Fort Jackson carronade, we would expect that total weight to be expressed as 21-1-2, but this requires calculation. We found one of the few we have taken pictures of and it's weight markings are also a bit odd. See the weight designation in the first photo below. It is 17-0-25. Expressed correctly, we believe it should be 17-1-0, but once again, this involves a brief calculation. You can't really draw any conclusions based on just two observations, but maybe, just maybe, the foundry workers simply stamped numbers that anyone could understand, without any real concern for following strict conventions. As for the C. F., we really are not sure, but Carron Foundry might be a logical surmise. The 'G' is not too difficult if you are aware of the British Monarch ruling in 1827. He was King George IV, the eldest son of King George III whose rule encompassed the French and Indian War, the American Revolution, the French Revolution, the War of 1812 and Napoleon's defeat at Waterloo in 1815. George IV ruled from 1820 to 1830.
We sure are glad you took all those excellent photos. They sure bring back pleasant memories. We love Savannah, GA.
Regards,
Mike and Tracy