Hi everyone,
late but true, finally the right person shown as sulphide was
tracked down; it also got a strong hint to the Ysart
family (roots in Spain) because the sulphide most likely shows
https://en.wikipedia.org/wiki/Alfonso_XIII_of_SpainThe form was taken from a medal, I have lost the link meanwhile but it will be possible
to refresh knowledge by a picture search for Alfonso XIII medal, I'm sure...
...which leads me to assume that Ysart (the father?) made
it to commemorate Alfonso's death after 1941... (still Moncrieff, but possibly pre-Ysart Brothers estd. in 1946)
The weight has been offered and is still for sale at the common auction platform for a while now,
best wishes e.m.