A lot of funkiness, since you ask. That does not look like a Bess barrel. The lock mortice inletting looks to have been messed around with more recently and I don't know WT F is going on with that lock but I'd guess at the very least it's a reconversion or something made up of parts of other locks, some much later than Annely's working period. I really don't know what to tell you other than that the entire thing to me looks cobbled together, later than War-era and just plain weird. I definitely would not view it as a 'COS' piece.