This issue is a variant of Captain America (Marvel, 1968 series) #248 [Direct Edition]. There exist further variants.
Some Newsstand Editions came with the 4 page color Mark Jewelers insert.
Letters page article and replies by Roger Stern. Includes a letter from Lindsay Meeks. Accompanied by a "Marvel Two-In-One" ad at the bottom- "Ya just never know what's gonna hit ya around here!"