It's great to be an expert. Snoopy appears here for the 6th time here solo (and he has 2 more appearances as part of a Peanuts set). He definitely wears the crown for most skateboard-related merchandise pumped out. This time Snoopy is riding on the side of a milk glass mug. It's dated 1958 but that is just the character - I'm not sure when this mug is actually from.
Previous Snoopy appearances on BPA: Wind-up Snoopy, Snoopy Sports Surprise Tin, Poochiefied Snoopy, The Easter Beagle, Work Out Snoopy, Peanuts Skate N Surf set, & Peanuts Mini Skateboard set.