This massive hunk of metal was one of those 'dream toys for boys' when I was a kid. The trail arms flipped open on unhitching and spades were carried to then fit under the ends. It had a spring-loaded brass shell case to receive a push-in plastic warhead, which all then loaded into the breech just like the real thing. A slight pressure on the lever and the shell was shot way across the room - further than any of your other guns could reach... ideal also for shooting pet cats and budgies. The whole was finished in 1950's British Army "bronze green"
My original Long Tom was o/s after my sister swallowed the firing pin, which is also sprung and sits inside the breech cover; this has a metal tab on it which realistically yanks out the empty shell casing after firing. We watched her for any news for a couple of days but it never reappeared