07-04-2015 03:29 PM
Does anyone know who used the Delta/triangle? It might be H Kroll & Co, but I'm not convinced.
07-05-2015 03:22 AM
FWIW, I checked Rainwater and the delta mark is shown on p. 147 under the listing for H. Kroll & Co as one of the marks they specifically used on 10k rings. (ISBN 0887401201).
07-05-2015 10:31 AM