The Constitution probably had a registry lower than 956
Why would you say that?
If you're referring to the Eagle
from ST VI: If I interpret that scene correctly (the Operation Retrieve poster), the use of a Constitution
-class-looking icon to depict that ship on the poster...is probably meaningless. As in: There's no significance in using an icon that looks like a Connie. I think it was just intended as a generic picture of a ship. The various vessels intended to be used in Operation Retrieve could have been of any class, yet for making that one poster, just one icon was used for all of them. Just a generic picture meaning "ship".