Dammitdon

wHERE CAN I LOOK FOR VALUE OF OLD COLLECTABLE SPARK ENGINES. I AM GOING TO A SWAP MEETING TO SELL AND NEED TO PUT A VALUE ON THEM?

coriolan

There is no fixed value for old ignition engines ( it depend on the condition and rarity as well as demand) and old doesn't necessarily mean "collectable". Swap meet aren't the best place to sell valuable engines! Take a look at a recent Auction:
http://www.gildings.co.uk/search_res...s_per_page=100

Stoneweapon

Try to search for finished auctions of the desired engines in the big bay.