Interesting read. I have always thought about the hoards of bent swords that are found and wondered if they were testing the swords and just leaving the poorly made and badly tempered ones. I wonder if these bronze hoards are the same way and thats why the tools were broken before being...
The copper 9mm one is modern. 1900 or newer. The other one looks older and is possibly a 38-40 which is 40 caliber/10mm. Thats my guess anyways. Neat finds!!!
What I think you have there is an early 1800's axe. The blade part looks to be a separate piece from the back. In the old days good Steel was expensive and they would use it for the cutting edge and have Iron for the rest. I have a meat cleaver made that way with a still blade edge adn the...
I don't think thats a swivel gun. Looks more like a Carronade or like this 2 pounder https://www.ima-usa.com/collections/cannons/products/original-18th-century-bronze-2-pounder-falcon-cannon-with-oak-naval-carriage