not my area, but I can see the fascination with these things - not the least of which is they don't take up much space.
What looks to be a Clouded Yellow painted on a white ground with five windows plus the top facet - came from a boot sale last year some time.
Although I don't especially collect weights, I'm aware of the name R. Annenberg - and the signature on this one does look vaguely similar - and it does have an upper case R. in front. Following the name there is a year date of '1999' then 'No. 1'.
The windows have been very well cut and polished, and the pontil scar which was on the underside of the white base has been removed with care. Diameter is about 3.25" maximum.
Grateful if someone is able to advise if this is from that person or not, and thanks for looking.