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The Card Ralph filled in is referred to as a "12 Question" one. The 12th Question is "Do you claim exemption from draft (specify grounds)?" The card is filled out by the man themselves unless they couldn't write and no "codes" were used. Of all the ones I have seen since Ancestry has had this database (except this one card), all I have ever seen is a blank answer or "No" written or a written out excuse... "Have to support family", "sole support of family" or "have a missing limb"
The could be the numbers were probably written by a clerk of the Draft Board. Could be anything, like the number of cards collected that month. If you look at the top of the card you will seen the same 1772, much smaller.