What is the value of the silver certificate one dollar US Bill 1928 A

At least $1 and the rest depends on the condition. We can't establish the value without inspecting it so take it to 3 coin dealers and see what they offer.

Silver Certificates are worth a very small premium over face value. Circulated examples typically sell for $1.25 to $1.50 each, while Uncirculated $1 Silver Certificates are worth between $2 and $4 each. Exceptions to these values include Star notes (where the serial number is followed by a small star in place of the suffix letter), and other various varieties and blocks including 1935A Hawaii and North Africa notes, Experimental notes, and various rare blocks and serial number ranges. Please refer to the Standard Guide to Small Size U.S. Paper Money (1928 to date), by Dean Oakes and John Schwartz, for more information.