I've compiled this list for you, and hope you'll find it useful.
"Fratelli Mollica is an Italian company that since 1964 has been
specialized in the hand-maded production of ecclesiastical items in
various metal, including gold and sterling silver."
"Ars Caeli is a leading firm from Milan, born at the beginning of the
fifties, in the silversmith and gold-smith district, in Ripa Ticinese
n. 55 and is a world-wide assurance for the production of vestments
"Since 1880, year of its foundation, Felli spa is producing religious
articles in metalware."
"Napoletana Arte Sacra s.n.c. is an artisan factory for vessels for
Lavorazione Arredi Sacri Gallo di Angelo e Armando Gallo snc
Bottega Artigiana Segatel
Luc di Nocerino
ELLE-CI di LISSI M. & C. snc
The next few are companies which seem to manufacture only some of the
products they sell.
ALDO BOVE E FIGLI SNC
Arte Sacra (click on "arredi")
Oscar Arredi Sacri
I'll explain the most successful searches I used. You may find a few
more companies worth contacting to establish whether or not they're
fabbrica "arredi sacri"
There are 154 companies listed under "religious goods"
and more than 200 in the Italian version, "articoli religiosi"
Many of these are shops selling medallions, rosaries, statues etc. but
you can try, as I did, using search words like "produzione"
(production - 37 results) and calice (chalice - 33 results) to focus
on companies of interest to you.
You can do the same with "arredi sacri" (church furnishings). This
time the companies you may want are mixed in with suppliers of
vestments and icons, and with non-Italian companies.
Google's language tools will provide rough translations of Italian text:
This site is useful for translating individual Italian words into English:
I hope this answer will be helpful, but please don't hesitate to ask
for clarification if you have any queries.
Best wishes - Leli