By a Sheva Brachos they had 2 cups to use for Bircas HaMazon and the Sheva Brachos. One was made of a silver and the other a simple glass cup. Is it preferable to use the silver one for Bircas HaMazon or for the Sheva Brachos? (or does it not matter which?)
Answer:
Perhaps it would be better to use the silver one for birkas ha-mazon, which is a Torah mitzvah.
On the other hand, perhaps one can argue that the sheva berachos cup is passed round, and there is more of a kavod ha-tzibbur in using it for sheva berachos.
The first argument seems stronger, but I don't see any obligation one way or the other.