Not recalling any in silver that were canti compatible. Most were black, from the plastic-levered GS200 and Exage to aluminum Alivio and Deore.
I have some NOS silver 7 and 8 speed integrated models meant for hybrid/comfort bike models, but these are for V-brakes. ST-EF28.

Shimano did make ST-EF50 and EF60 models in black and silver. Also two versions, 2-finger V-brake, and a 4-finger version. Not sure if the 4-finger was meant for cantilevers. The technical PDF for it doesn't state 'for V brakes'.