I found these in a German trench, all a few inches of each other. I can't seem to find what they are on the internet. Help please.... I do think the cross is from ww1, it had a red stone in the middle that fell out due to it being cracked. The date on it is 7-12-18/ 7-12-19. No idea if the shield is even German. Does anyone also know a good war to clean these up, I don't want to damage them.