This one is easy. Any of the various Jeffery names have level three Brand Value (BV3). The Original Quality grade is seven for a "plain border engraved BLE" (OQ7). The Current Condition is level four for "heavy use but no abuse." I'm assuming the barrels are carrying "tube numbers and are original." If the barrels are good, I'd not worry about the "mis-match" of numbers. As for chamber length, if you will confine yourself to low pressure loads, the chamber length is moot ( as shown by thousands and thousands of 2 3/4" hulls with low pressure loads fire in 2 1/2" chamber). BUT, you MUST be sure the load is low pressure. Hull length is no substitute for knowing what pressure you are shooting. RST is very good in this area of shooting.
BV3-OQ7-CC4 = $1233. That is USA median retail. More at a swankier shop and less for a person-to-person sale and even less to a dealer.
Questions?? Concerns???
DDA