Reading the great website of LondonJazzCollector (here), a site with all types of fantastic and interesting information about jazz vinyl and the collection of same, I came across some interesting information concerning labels and ways to date your Riverside album. My copy has conflicting information. According to the knowledgeable folks, albums after 12-272 had the small label, where the deep groove runs through the recording symbol gray box. As you can see, my copy didn’t know that. Any ideas?