I believe I have figured out exactly what these are. They were sold as WWII but I believe they are actually made from WWII aluminum detonator caps used either in shells or used to detonate the panzerfaust warhead. I believe I have seen these reference with 8cm mortar rounds but I also seem to find a lot of reference to the panzerfaust as well. They are likely early post war made from left over war materials. The top and bottom are marked fde Np10 but it can bee a little hard to make out through the pressed in ribs.
There is a little variation in these and not every one has the ribbed design on top and bottom, sorry, no choice. Most have the ribbed deisgn on top and bottom, but a few have a flat end (see photos). These are decent little lighters, they may need a new flint. Some may have rust. The price is for 1 lighter.