Sandy - welcome to the forum - we are here to help if we can.
As others have said, it really is not possible to give a definitive answer without further information, in particularly photographs of the movement. Barwise signed watches typically have high quality English movements. Reading between the lines it is possible that the watch is a pocket chronometer with a spring detent escapement - if that is broken, a repair will be very expensive. There are very few horologists who have the skills to make a replacement.
You may like to look at this
thread, and compare it with your watch - unfortunately, my example is only a movement, but fortunately the detent was not broken. A Barwise detent is a very fine watch, I hope the detent is not broken in which case it will be far less expensive to repair.
I assume you obtained the age of the watch from the hallmark on the case, this is reliable unless the movement has been re-cased, so you need to check that the movement is consistent with the date. If it is 1854 then it is should be signed Barwise & Sons, my movement is much earlier ~1820. By that date the serial numbers being used were of the format 12/xxx for example 12/273 was a pocket chronometer made in 1859 and purchased by the Admiralty. The output of Barwise at that time included watches with a range of escapements, including duplex and lever. Therefore, it may not be a pocket chronometer, but from the description you have been given, I think it probably is.
Ask the horologist - is the watch a pocket chronometer with a spring detent escapement?
John