@moon, your piece of Spiel Marke seems to be listed in Batty's Catalog (#1847 I think), although your piece doesn't have BOYCES underneath the bust. I see others for sale on
ebay and elsewhere, so not sure on the rarity.
"If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz