British Ordnance Collectors Network
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BOCN Guess what it is
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Ordnance is correct and what he didn't say, is that he has a projectile in his collection. The fin is from the U.S. experimental Breech Loading Mortar. Most of the fin fits into a short brass case. In the photo where the case is next to the fin, you can see that the crimping groove on the case lines up with small cut-outs on the fins, so in that photo the fin is shown at the depth that it would be inserted into the case. The makers did a wonderful job lettering the case, and you can see that they used a 12 gauge shotgun shell (cut short) for the primer. It is rumored that they turned down 75mm artillery projectiles to make the mortar body. The fin appears to be cast aluminum.
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Safety pin on a practice submunition ?
Yodamaster and Hazord are both partially correct. Not a grenade, but a training submunition for the Miles Laser System. They were intended to train soldiers to avoid picking up ordnance off the ground on the battlefield. When disturbed, they emit a flash of light through the translucent body to trigger the sensors on the Miles vest, telling the soldier he just became a casualty.
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US-Subs, yes that probably does look familiar. It's been too long to have come from the Bombatorium but certainly from the basement archives in a previous decade. Having done a poor job of declaring a clear winner last time. I'll try one more item..... 
