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'Old think' for grenades was to make a cast body with lugs that would fracture at pre-designated points, making a uniform sphere of fragmentation. Many countries used this formula. I wasn't until towards the end of the 2nd World War that they realized that it didn't work like that, and that new frag generating techniques were developed to ensure more consistant frag patterns. Enter the RG42, RGD-5, RGO and other new generation grenades with segmented spring coils, sheets and plastic bedded round steel balls.
Note the filler markings on the bottom of the grenade.
This grenade has what I believe to be a romanian fuze on it, but I have not found any documentation on it. It is a standard striker release design. Although difficult to see on this cutaway, the steel cap well liner is visible in this picture.
This is the training version of the F1, the URG. It comes in a nifty tin with several grenade bodies, many spoons, pins and a tool to recock the fuze. It also comes with special training 'caps' that make an audible report when functioned. The training versions are generally painted black, with white vertical and horizontal stripes, and red colored spoons and pull rings. The body has a hole in the bottom.
UZRGM fuzes have a variety of time delays. The fuzes come in a tin can, packed next to the grenade bodies in a wooden crate. Each fuze has a number stamped on the side, near the blasting cap. I have seen numbers from 0 to 15. This number represents the delay, in seconds, minus about two seconds. In other words, if you have a fuze with a '2' on it, it will be about a 4 second delay. A a 13 will be about a 15 second delay.
