Amber earclips

I found these earclips at a fleamarket yesterday, and I had to have them. I thought they were bakelite, but when I got home I immediatly inspected them more closely, and the turned out to be amber!
I have never before seen this type of amber earclips. they scream 1930 s to me, but the clips seem much newer and they have a stamp on them I cannot read, so i think these might be 1960 s Kaliningrad amber earclips. (See my earlier post from some time ago of a leaf and greaps kaliningrad amber brooch). Whatdo you think?