Hi,
Thats the original lock, however the reproduction would have a similar appearance if burnished and hardened correctly.
This is one thing we have noticed whilst in the USA, most repro locks we see are rarely finished to that sort of level, we assume that is because practical services from the item are a preference to that of authenticity, but why not have both?
We tried to market an early trade lock with a finish pertaining to that in the photo, however the production cost was extreme due to the level of finishing, but that is no reason why the builder can take up that particular task.
Kevin