I have dealt in and studied Antique and Vintage jewelry first hand
for over 30 years. I will never say I know everything there is to
know but I will say that I am well versed.
During any time period there may be artists or jewelers working on a
similar style using differing techniques.
There may very well have been pieces created between 1900 and 1910
in the Edwardian style using hand piercing but handmade pieces using
Platinum wire and flatwire folded into a filigree and then milgrained
is in fact from 1900 to 1910 and not a bad imitation.
The bulk of the pierced and die stamped pieces are actually from
after 1910 and remained popular until the 1940's.