The time elapsed between the death of Harrison and when his first stamp was issued was compared to Lincoln and Harding to give the reader a perspective of this affair. Had I mentioned the Lincoln stamp by itself it would in that event be somewhat irrelevant. As for centering, this is usually employed under paintings, portraits and the like and works very well with stamp images which are very similar to a portrait and gives the text a much better appearance and I see no reason why it should not be employed. After all, Wikipedia gives the editor an assortment of tools to work with in the overall formatting of an article. As for 'bulky html' anyone who has trouble with a simple 'table' arrangement  should not be editing articles in the first place. I don't mean to sound curt but it seems too many editors assume that the text and formatting should be used with the mind that the common denominator of the average reader/editor is at the 3rd grade level.