Doesn't the portion of text on the cert above the "and we are of the opinion that" reflect the description of the submitter? IOW, the PF did not identify the the position on the older cert as 97R1L, but rather the submitter did. The second time around the submitter identified it as 96R1L, with which the PF agreed.
I was looking for a couple items in that sale to chase, and that cover was on my short list. I didn't bid on it though, and wound up getting a different item.
One subtle thing about Chips cover - beautiful stamps aside, is it was carried by an American packet steamer. During 1855 the Crimean war caused many British Cunard steamers to get diverted to assist the war effort. As a result, the formerly much less used American packet steamers started carrying more of the transatlantic mail load.
For normal letters, this was much more expensive to the sender, who had to fork out 21c versus just 5c for the British packet. The exception: printed matter such as this was 2c to western europe regardless of packet.