Set of 4 Luftwaffe Signal Troops Insulators

Set of 4 Luftwaffe Signal Troops Insulators (Luftnachrichten Isolatoren). These insulaters could be nailed to, for example, a tree to create connection lines for communication. The black bakelite insulators are nicely marked with 'LM25275' indicating Luftwaffe Signal Troop issue (Luftnachrichten), one example looks to be unmarked. The bakelite insulaters are showing normal traces of usage. Decorative original items!