First Things First... The Signature
I cant begin to express the annoyance that the collecting community and those who enjoy the works of Luigi Kasimir face when trying to locate and purchase his etchings. This problem exists because after Luigi's death in 1962 his son Robert and wife Tanna continued use of the original plates to print etchings selling them to the public even signing them "Luigi Kasimir". Normally artists destroy the original plates so that in the future no one can print more works securing / protecting their already printed body of work but for some unknown reason this never happen.
This adds a more difficult task for acquisition because one must be able to determine whether the Kasimir etching in consideration has the original signature (ie. also printed by Luigi) or was signed by his son or wife after his death known as an "Estate Etching". The original signed works carry a considerable higher value and collectibility to that of his estate works and deservingly! While his son and wife were very talented artists in their own right, carrying an unbelievably similar style to that of Luigi, the impact made on early 20th century printmaking was not as significant. People also sell original Tanna and Robert prints as Luigi's due to the similar style.
I have seen hundreds of Luigi Kasimir etchings being inaccurately sold from online platforms like eBay, ebth and etsy; but also from higher standing auction websites like Live Auctioneers, 1st Dibs and even formal galleries! To help you and all other interested parties I have put together an example of all possible signatures you may run across on a work by any one from the Kasimir family which include 5 different signatures you must learn to recognize!