few more unusual keys

[nozza36]

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Weird stuff , make your own mind up on this chaps

[Solomon]

Badass! They look like old warded keys. That weird one might be a bramah.

[LocksmithArmy]

warded or lever... or both...

and that wierd one is NOT bramah... but it is wierd... i have no idea what it is... REALLY early tubular lol (doubtful)
barmah keys have actual slits in the outside of the cylinder... that one only has indentions...

[huxleypig]

The round one could be an early Fichet or similar French lock.

[10ringo10]

old safe key.... BIRMINGHAM EST 1840
Known as the E COTTERILL CLIMAX DETECTOR LOCK
Derived from the bramah lock, although the sliders move radially in respect to the key, in 1890 FE WILSON took over and the wilson patent for the lock,called the lock the COTTERILL WILSON LOCK of birmingham.
very interesting and a bit of english history for you as well.

[10ringo10]

This a nice representation of the key

[rai]

looking at the bittin on those keys in the first post, I think they may be a collection of skeleton keys,

skeleton means reduced in size to more easily go into a variety of different locks, and the bittings are also reduced to the least necessary to avoid wards and lift the bolt pickup.

there are also many photos somewhere on the internet, of large collections of keys that have bittings to use on lever locks
when you think about it, the number of possible combinations on many of these locks is actually quite low, especially three lever models, and much of the security comes from wards, thick or thin keyshafts, etc.