#'s  1834-1837,     "NORTHWEST INDIAN MASKS."    15-Cent,  Complete Set of Four (4),  Two Stamps each on Two (2) Covers. 1980  Unaddressed First Day of Issue Covers.  The "Postal Commemorative Society Special Edition-ArtCraft" Covers were Cancelled on September 25th, 1980 at Spokane, WA.   They are Attractive,  High Quality, Unaddressed, Clean and Fresh covers neatly mounted on Postal Commemorative Society pages and include a Synopsis printed on the Accompanying Pages pertaining to the Indian Masks.  First Day Covers will be mailed securely via USPS.   Postage for U.S. Mailing, the first lot will cost $4.00, with additional lots at 50 cents each.    Foreign Mailing will cost $8.00 for the first lot, with additional lots at $1.00 each.  Foreign Mailing May Require REGISTERED Postage Costs.    Please Review your Mailing Costs.  You can Save on your Postage with Multiple Lot Purchases.   Please Request an Invoice for any Multiple Lot Purchase and Wait for a Combined Postage Invoice Before Submitting Payment.   Take some time to look at the other First Day Covers listed in my Ebay Store.  Also, check out my U.S. and Foreign Stamps, Commemorative Panels and Pages, Picture Postcards, Coins and Currency, Sports and Non-Sports Cards.  Thank you for Viewing this Lot.