Alameda and Contra Costa Counties. Attractive collection of over 300 covers (all in plastic sleeves) evenly divided between the two counties with most towns represented (no Berkeley or Oakland), some 19th century but primarily 20th century to the 1960's, many covers with corner cards, some illustrated advertising, numerous better uses (registered, special delivery, etc.) and unusual uses (missent, unclaimed, postage due, officially sealed, etc.), Very Fine lot. Estimate  $400 - 600. $0