I HAVE MODELS R, N LC,H 61JC AND 12H and wondering if anyone can identify year and what they might be worth. They are restored and all run good.
These are all examples of early Lister water cooled petrol engines.
The 12H (H indicates Hopper cooled) is a Lister D type if its the early shaft drive magneto version then it will be quite desirable. If its the later chain drive then its not so desirable, as Listers made thousands of these engines up until the mid 1960's
The rest are: H, J, L, N, and R types, they are are all basically the same design single cylinder side valve, and range from about 3HP for the H type, to 10HP for the R type. Fora more definitive description I suggest you refer to a book written by David Eggington 'Know your Lister's'.
As to price, these are all desirable engines [particuarly the H and R types as they do not seem to be that prevalent] to the right person. Keeping a watch on eBay for similar items to appear will be a good a guide as any.