I saw a football shaped, silver metalic object,very high,going very fast.

I was working at Bethlehem steel shipyard at 20th st. off 3rd st. in San Francisco at lunch time.It was a clear cloudless day. I happened to lean back & look stright up and saw the object from directly below.It was silver , metalic , maybe a little thinner than a football the ends were sharp points.Its lines were not fuzzy but well defined & sharp. The object was so high that i felt if i took my eyes off it for a second i might not be able to find it again. three other people with me did not see it but i could understand why.The object was moving west to east.There was no sound.It became too small to see at about 45 to 35 deg's to the horizon.    This object was real I do so swear.