As I interpret this mark, Rasmussen went to stamp his job and found that the concrete had set too hard, so he slapped a little fresh cement on it and did what he could, creating a rare raised stamp.
Unlike my previous example from 1934, this has a truly clear-cut date. It also gives me a chance to show one of Rasmussen’s typical double marks. Also note the reversed last letter, which is visible only in very well preserved Rasmussen stamps.