Three of these are signed Helmert, which I suppose is Herbert Helmert, given the similarity of style: https://www.askart.com/artist/Herbert_Helmert/11106541/Herbert_Helmert.aspx Reply
Dutch Artist is Helmert R. Miller (also known as R.M. Helmert, pen name of Helmert Mulder). A few works here : https://www.flickriver.com/groups/1434083@N23/pool/interesting/ Reply
Three of these are signed Helmert, which I suppose is Herbert Helmert, given the similarity of style:
https://www.askart.com/artist/Herbert_Helmert/11106541/Herbert_Helmert.aspx
Dutch Artist is Helmert R. Miller (also known as R.M. Helmert, pen name of Helmert Mulder).
A few works here :
https://www.flickriver.com/groups/1434083@N23/pool/interesting/