Strömbergshyttan miniature vases / cigarrete cases

I do love Strombergshyttan stuff, but it is so difficult to date it! It is hard to tell when they were made. Some designs look really 30s and ArtDéco-ish and it's known Gerda Strömberg started designing for her company in 1933, the very same year she and her husband Edvard created it. Also, apart from some pieces designed by Gunnar Nylund is really difficult to identify the designers: Gerda Strömberg, Asta Strömberg...

Could anyone help with this items?