A 1916 advertisement for Holmes’ Milk-Made Bread featuring Walter Johnson.
“Come on, Boys!
“Get a Baseball Outfit for the whole team, Free!
“In order to promote the wholesome habit of eating Holmes’ Milk-Made Bread among the baseball Fans of Washington we have introduced a Great Baseball Outfit Contest.”
In order to win the contest, all 200 of the cards (one in each 10 cent loaf) would have to be collected and returned to the company.
The first prize was a complete set of 10 uniforms, second prize was 10 gloves, third prize was a complete set of catcher’s gear, and fourth prize was a framed sheet of the 200 cards.
The company encouraged kids to:
“Get busy–go around your home folks and friends, and tell them to buy Holmes’ Milk-Made Wrapped Bread every day and save the baseball pictures for you . With a little hustling on your part, you will soon get the complete collection of pictures and cop out one of the prizes.”
Another ad included pictures of some of the cards–Hughie Jennings, Frank Baker, Johnson, Honus Wagner and Eddie Collins:
There is no evidence that anyone actually collected 200 cards and won any of the prizes.
The Jim Thorpe card from the set
Baseball History Daily 
“There is no evidence that anyone actually collected 200 cards and won any of the prizes.”
If you used just one loaf a bread a week, it would take someone just under 4 years to collect all 200 cards – assuming that there was a different card in each loaf.
The smart way would have been for team members to but multiple loaves at a time to decrease the time required to collect all the cards.
It would probably cost about $25- $30 to complete a set, viven that the distrobution was probably fairly poor–that is even if all two hundred were actually available in a given section of D.C., which I think is why they pretty much encouraged kids to go to their neighbors and beg for them.