A little more information about the box would be needed to provide an accurate answer. Dating for Western runs in 20 year cycles. For Western, the "BH" supplies the date. H would indicate the month of August (8th letter of the alphabet), and the B would indicate 2008, 1988, 1968, 1948, etc. One clue is if there is a child safety warning on the box, it would be later than the early 1960s, i.e., 1968, 1988, or 2008. If not, 1948 or earlier. There are usually differences in the box graphics design that can be used to bracket the date within a 20 year cycle. A picture would help. I don't know what the 52CN means, but I don't think it is a date code.