That is a very nice set and I learned something. I didn't realize that the eagle 's tongue shows on the Reverse of '38 on the 1840-(O). I usually look for the narrow wing tips on the reverse of '38. Here's mine, also a WB-4 like yours is. The WB-4 is actually a common die marriage (R3) but the demand for this "mule" pushes the price way up. I purchased this as a raw coin off eBay. It was improperly labeled as an 1840 but sold at full retail back then for a 1840-(O).
