Thanks for the help so far.
For those of you old enough to remember, the Law's was a big deal in Dirty Harry - The Enforcer. It got played up almost as much as his Model 29.
Iirc they were designed to be cheap and compact firepower for use on light skinned vehicles. A step up from the M79 40mm launchers but not as cumbersome as the Carl Gustav's of the day. I also seem to recall the CAF was the first to figure out how to reload them thanks to Shiny Pony senior's budget cuts. They're fairly common in the States but I've never seen one up here except on an airsoft website.
The silver casing is a 105mm. The APFSDS/T should mean it was for a Leopard 1 main gun firing a tank buster Armored Piercing Fin Stabilized Discarding Sabot. Pretty sure the ' T ' would mean Tungsten as opposed to the Depleted Uranium the Americans preferred. The rusty one is a 90mm. Marking are a bit harder to read on that one atm. Going to scrub it up and see if it I can get it clearer. The shell is a 155mm Smoke. 60 pounds empty all by itself. Not sure how much heavier it gets when the charge gets added. Suffice it to say I'm 100 % sure I'm to old and out of shape to volunteer for artillery duty.
The bonus is my buddy called me back earlier today and it seems there's at least a bit more fun stuff he wants me to come clean up. If it's half as good as this I wont mind bathing in dirt again for half a day.