Interesting. It is not a commercial replica. It looks the part of an English gun, but no marks on the lock, which is strange as even the replica round faced musket locks have Grice or other marks as in a crown on them. The barrel, if English, should have proof marks just up from the breech and on the left side of the barrel.(opposite the cock) They could be under the barrel, but that is not normal. On the side, above the wood is where they should be.
If it is "newly" made, it is a good job of antiquing. There are gun makers who are VERY good at this.