Ehhh... The guideline 'did it exist in the 18th century' isn't bad but considering the few examples we have in game it's kind of inaccurate. Then again the spread of instruments we do see is all over the place and just plain weird. For example, the manor 'harpsichord' that looks and sounds every bit the modern piano. Triggered.
The French horn you reference is in appearance much closer to a sousaphone, and given it's called 'manor marching horn,' it would be safe to assume that's what it is based off of. The sousaphone was first built at the very tail end of the 19th century. The timpani we have in game is clearly pedal tuned, which was not introduced until the late 19th century as well. With that in mind, it does stand to reason that even the upright piano, which came about in the early-mid 19th century, could very easily exist - it just might not take its modern day form.
Weirdly enough, the manor harp doesn't have any pedals, which were first introduced in the late 18th century and continuously improved upon after. So the harps don't have pedals (or maybe they do, just this one doesn't) but we have early sousaphones and pedal-tuned timpani. It's wild. Doesn't make any god damn sense.
So anyway, what I'm trying to say is... so long as it fits in with the setting, it's pretty reasonable for it to exist. Even saxophones and, dare I say it, banjos. Just no crazy, modern, electric, new age stuff and you should be fine.
The French horn you reference is in appearance much closer to a sousaphone, and given it's called 'manor marching horn,' it would be safe to assume that's what it is based off of. The sousaphone was first built at the very tail end of the 19th century. The timpani we have in game is clearly pedal tuned, which was not introduced until the late 19th century as well. With that in mind, it does stand to reason that even the upright piano, which came about in the early-mid 19th century, could very easily exist - it just might not take its modern day form.
Weirdly enough, the manor harp doesn't have any pedals, which were first introduced in the late 18th century and continuously improved upon after. So the harps don't have pedals (or maybe they do, just this one doesn't) but we have early sousaphones and pedal-tuned timpani. It's wild. Doesn't make any god damn sense.
So anyway, what I'm trying to say is... so long as it fits in with the setting, it's pretty reasonable for it to exist. Even saxophones and, dare I say it, banjos. Just no crazy, modern, electric, new age stuff and you should be fine.
