This bedroom door lock is functionally the same as the utilitarian rim locks elsewhere on the same property, wherein the handle moves the latch will releases the door and the key turns the bolt that secures the door, independently of the latch. There are are two noticeable differences.
Firstly, the key hole cover.
Rim lock from the 1830s. The logo isn't clear on this lock.
This is from a similar lock (or mabye a bit older, because the top lock has "Patent Expired" where this one hasn't.) shows the arms of William IV pf the United Kingdow (reigned 1830-1836). Made in the UK, these locks were exported to Australia (where this one is) and the USA.