The stock is cast in silver (modeled in wax,) in sections which are then soldered together. They are finished with filing, engraving and polishing. While the forearm may occasionally be embossed and engraved, this one looks to be entirely cast. Fine example. There is no filigree evident.
Like much else that has to do with metalworking, the terms which apply to embellishment are often used indiscriminately; these links provide some specific definitions:
https://en.wikipedia.org/wiki/Engraving
https://en.wikipedia.org/wiki/Repouss%C3%A9_and_chasing