NOS - Vintage Sierra Ribbed Bakelite OUTLET Wall Plate Duplex Cover BROWN MCM

NOS -- MINT / Near Mint Condition Selection!Sierra Art DecoRibbed OUTLET Cover PlateBROWN With New Screws!!!Circa 1942 - 1950sLimited time SALE PRICE on MINT plates with Screws!MOSTLY FROM NOS CONTRACTOR PACKSAll Plates are hand washed and free of paint.Plates are free of any chips or fleabitesPlates are lightly hand polished to insure quality NEW-LIKE matching finish.Comes with NEW matching Ivory Finish Installation Screws!Some plates are refurbished used to NEW conditionALL plates are inspected multiple times to be as close to Perfect Condition as you will find ANYWHERE!Some restored plates are occasionally in this lot since these are of equal quality and mostly because we can not tell the difference when they get mixed in by accident.As per 1942 design patent 151,907 applied for in 1946 and granted in 1948, these are original D-1 Art Deco Brown Bakelite wall plates by Sierra / McDonald Mfg.Dating Your Ribbed Sierra Wall Plates:1. Plates marked "McDonald MFG CO" with NO patent reference are early 1940s -19452. Plates marked "McDonald MFG CO" with "Patent Pend" or "Patent Applied for" are about mid-1946 3. Plates marked "Patent Applied For" but WITHOUT CSA mark are from ca. Late 19464. Plates marked "Patent Applied For" AND WITH "CSA" mark are from Late 1946 -1948 NOTE: CSA marking ("SA" inside a "C") was inspection mark introduced in 19465. Plates marked "Patent Applied For" AND WITH "Pat 151,907" (often in circle) are ca. 1948 approximate6. Plates marked "Pat 151,907" (No patent pend or pat applied for) are After 1948