Carefully removing the entire lock and attaching a pic of the backside and the wood interior will give-up a lot of information.
Looks French to me -similar to a smaller one I have. The barrel style matches and the lock is not miquelette style -sorry Chris- . Suggest late 1700's style . If it is an original that has been restored probably in the $1300- range. If modern made - no value other than parts.