While working as a clock restorer in England, 28 years ago, I was fortunate to get a James Condliff skeleton clock. The clock was 2 train fusee, balance wheel, employing a lever escapement with helical spring in a central balance cage.
I was fascinated by the large oscillating balance and what looked like a large chronometer, at a glance.

Unfinished Condliff inspired skeleton clock

I became driven to build my own clock on the close lines of the Condliff.
All the clocks i have seen with this type which is termed "2nd series" have a rectangular glass dome and a rectangular wooden base. They also have and integral English lever escapement. As far as I know Condliff never made chronometer escapements in these clocks. They are all lever escapements that from a distance look like a chronometer because of the helical hairspring.
Having worked on many marine chronometers I was determined to encompass into my clock the chronometer escapement. The idea was re-inforced when I serviced a Black skeleton chronometer

Left-Inside backplate of an original James Condliff second series balance wheel lever escapement skeleton clock. Note, all plain bearings.

Right-Inside backplate of my chronometer escapement skeleton clock.
        Note, jewel bearings and ball beraing fitted to one side.

SO i designed the escapement with a Breguet escape wheel and his spring detent, escapement. A single beat escapement beating 7200 vibs/hr. The coaxial seconds hand actually shows seconds on the dial.
So this would be the only clock that looked like a Condliff 2nd series clock with a single beat chronometer escapement. It was a test of my skill.

Condliff never used an oval glass dome on his 2nd series clocks, he used a specially blown rectangular glass shade with flat sides and rounded corners. Initially I invested in the idea of making a rectangular dome, but this would cost a fortune and i wanted to get on with the clock. John Neilson, son of Brig. Neilson, the late well known clock dealer of tetbury agreed to make the oval base from an old mahogany cupboard he had. I gave him the dimensions and he did a superb job, it looked and felt form the 1860's.
 

The original 2nd series lever clocks had cast brass plates of 1/8th thickness and seemed flimsy to me, no castings were used in my clock I decided to make mine from 3/16th thick leaded engraving brass that was all hand cut. Also Condliff used a gong in the base, tripped the striking train above, by a fine wire.

I decided a bell would have a much better sound, so i installed one in the base, I also installed Large jewels all through the going train. The exeption is the going barrel. This is fitted with a ball race to reduce friction.

I know from working on enough Condiff clocks that he DID NOT use jewels in the going train- just plain brass on steel bearings were used.
On all 2nd series clocks the frame around the 2 mid pillar positions is left with a circular shape to conform with the round washer.

On my clock I made the triangle scroll curved projection similar to the top pillar scroll projection to further refine the design.

The clock I made was finished in 2000 and sold to an American collector and is now posing as an original James Condliff in a well know American collection.

My clock is easy to distinguish. It is the only single beat, Condliff skeleton chronometer with a "Breguet" french escape wheel. Also the going train is fully jeweled and the going barrel has a modern ball bearing fitted.

This clock was many years in the making but was worth it, I succeeded in making something unique. 

19th century 8-day marine chronometer, by H. Hughes& son, London.

Chronometer dial work, which i previously silvered.

Hughes 8 day movement.

Work consisted of mainspring replacement and new balance staff.
 *note* parts are unavailable for these, so they have to be made by hand.

Dutch striking, quarter chimming longcase clock by William Gibb, Rotterdam

Dial work of the dutch musical clock.

This restoration consisted of replacement of the musical train, including bells and hammers as these were missing.

New hammer and bells.