http://www.stampcollectioninfo.com/envelope-fdc/
For FDC (first day covers) and collection and storage, which offers the best protection of the envelope or sticker?
For FDC (envelopes the first day) the collection and storage, which offers the best protection of the crystal envelope or sleeve vinyl? I'm interested in storage long term.
I think the question you really should consider is: self-adhesive Mylar Vs Vs vellum vinyl does not seem a viable option.
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 U606 20c 1984 SMALL BUSINESS SET OF 2 BAYLESS CACHET STAMPED ENVELOPE FDCS $2.49 Time Remaining: 45m Buy It Now for only: $2.49 |
 U605 20c 1983 PARALYZED VETERANS SET OF 2 BAYLESS CACHET STAMPED ENVELOPE FDCS $2.99 Time Remaining: 56m Buy It Now for only: $2.99 |
 U584 Energy Conservation Stamped Envelope FDC House of Farnam Cachet $0.50 Time Remaining: 1h 13m |
 1964 NEW YORK WORLDS FAIR 5 CENT STAMPED ENVELOPE NO CACHET UNADDRESSED FDC $1.19 Time Remaining: 1h 23m Buy It Now for only: $1.19 |
 U611 25c 1988 STARS + USA SET OF 4 BAYLESS CACHET STAMPED ENVELOPE FDCS $3.45 Time Remaining: 1h 25m Buy It Now for only: $3.45 |
 945 FDC embossed Postmaster General Envelope plus 1452 and 1454 FDCs $1.99 Time Remaining: 1h 28m |
 1937 FIRST DAY COVER JUNEAU ALASKA Stamp+Cachet envelope $4.99 Time Remaining: 1h 33m |
 1937 FIRST DAY COVER ISSUE HONOLULU HAWAII Stamp+US EAGLECachet envelope $4.99 Time Remaining: 1h 36m |
 1937 FIRST DAY COVER Virgin Islands CHARLOTTE AMALIE Stamp+EAGLE Cachet envelope $4.99 Time Remaining: 1h 37m |
 U587 15c AUTO RACING 10 ENVELOPE BAYLESS STAMPED ENVELOPE FDC $0.99 Time Remaining: 1h 37m |
 1985 FDC US Old Ironsides Embossed Stamped Envelope on Information Page U609 $1.25 Time Remaining: 2h 8m |
 C79 FDC 13c WINGED ENVELOPE FLEETWOOD U A $3.00 Time Remaining: 2h 33m Buy It Now for only: $3.00 |
 U532 1c FRANKLIN ENVELOPE FIRST DAY COVER CACHET CRAFT $3.00 Time Remaining: 2h 36m Buy It Now for only: $3.00 |
 U532 1c FRANKLIN ENVELOPE FIRST DAY COVER FULTON $7.50 Time Remaining: 2h 37m Buy It Now for only: $7.50 |
 U533 2c WASH ENVELOPE FIRST DAY COVER CACHET CRAFT $3.00 Time Remaining: 2h 38m Buy It Now for only: $3.00 |
 U533 2c WASHINGTON ENVELOPE FIRST DAY COVER FLUEGEL $6.00 Time Remaining: 2h 39m Buy It Now for only: $6.00 |
 U533 2c WASHINGTON ENVELOPE FIRST DAY COVER FULTON $7.50 Time Remaining: 2h 40m Buy It Now for only: $7.50 |
 U534 3c WASH ENVELOPE FIRST DAY COVER CACHET CRAFT $3.00 Time Remaining: 2h 41m Buy It Now for only: $3.00 |
 HAWAII TERRITORY FIRST DAY COVER 799 PILGRIM CACHET ORANGE ENVELOPE ITEM 935 $22.45 Time Remaining: 2h 42m Buy It Now for only: $22.45 |
 U534 3c WASHINGTON ENVELOPE FIRST DAY COVER FULTON $7.50 Time Remaining: 2h 42m Buy It Now for only: $7.50 |
 U542 2 1 2c WASHINGTON ENVELOPE FDC FLUEGEL $4.00 Time Remaining: 2h 44m Buy It Now for only: $4.00 |
 U543 4c PONY EXPRESS ENVELOPE FDC ED HACKER $2.00 Time Remaining: 2h 46m Buy It Now for only: $2.00 |
 U544 5c GEORGE WASHINGTON ENVELOPE FDC CASCADE $3.00 Time Remaining: 2h 48m Buy It Now for only: $3.00 |
 U544 5c GEORGE WASHINGTON ENVELOPE FDC CENTENNIAL $2.00 Time Remaining: 2h 49m Buy It Now for only: $2.00 |
 U550 5c EAGLE ENVELOPE FDC ANDERSON GREEN $2.00 Time Remaining: 2h 52m Buy It Now for only: $2.00 |
 C83 FDC 13c WINGED ENVELOPE COIL PAIR FLEETWOOD U A $3.25 Time Remaining: 2h 52m Buy It Now for only: $3.25 |
 U550 5c EAGLE ENVELOPE FDC ANDERSON PURPLE $2.00 Time Remaining: 2h 53m Buy It Now for only: $2.00 |
 U550 5c EAGLE ENVELOPE FIRST DAY COVER CENTENNIAL $2.00 Time Remaining: 2h 54m Buy It Now for only: $2.00 |
 U555 6c YOUTH CONFERENCE ENVELOPE FDC ANDERSON BLUE $2.00 Time Remaining: 2h 55m Buy It Now for only: $2.00 |
 U555 6c YOUTH CONFERENCE ENVELOPE FDC ANDERSON GREEN $2.00 Time Remaining: 2h 56m Buy It Now for only: $2.00 |
 U556 17c LIBERTY BELL ENVELOPE FDC ANDERSON GREEN $2.00 Time Remaining: 2h 57m Buy It Now for only: $2.00 |
 U556 17c LIBERTY BELL ENVELOPE FDC ANDERSON PURPLE $2.00 Time Remaining: 2h 58m Buy It Now for only: $2.00 |
 U557 8c EAGLE ENVELOPE FDC ANDERSON RED $2.00 Time Remaining: 2h 59m Buy It Now for only: $2.00 |
 U567 10c LIBERTY BELL ENVELOPE FDC ANDERSON BLACK $2.00 Time Remaining: 3h 2m Buy It Now for only: $2.00 |
 U568 1 8 10c NON PROFIT ENVELOPE FDC ANDERSON BLACK $2.00 Time Remaining: 3h 3m Buy It Now for only: $2.00 |
 U572 13c HOMEMAKER ENVELOPE FDC ANDERSON BROWN $2.00 Time Remaining: 3h 4m Buy It Now for only: $2.00 |
 U573 13c AMERICAN FARMER ENVELOPE FDC ANDERSON BROWN $2.00 Time Remaining: 3h 5m Buy It Now for only: $2.00 |
 U576 13c LIBERTY TREE ENVELOPE FDC ANDERSON BROWN $2.00 Time Remaining: 3h 6m Buy It Now for only: $2.00 |
 U577 2c NON PROFIT ORG ENVELOPE FDC ANDERSON RED $2.00 Time Remaining: 3h 7m Buy It Now for only: $2.00 |
 U578 21c NON PROFIT ORG ENVELOPE FDC ANDERSON RED $2.00 Time Remaining: 3h 8m Buy It Now for only: $2.00 |
 U582 13c BICENTENNIAL ENVELOPE FDC ANDERSON GREEN $2.00 Time Remaining: 3h 9m Buy It Now for only: $2.00 |
 U566 8c EAGLE W 2c SURCHARGE SET OF 5 MC BAYLESS CACHET STAMPED ENVELOPE FDCS $6.45 Time Remaining: 3h 10m Buy It Now for only: $6.45 |
 U590 35c NON PROFIT ENVELOPE FDC ANDREWS $2.00 Time Remaining: 3h 10m Buy It Now for only: $2.00 |
 U590 35c NON PROFIT 10 ENVELOPE FDC ANDREWS $2.00 Time Remaining: 3h 11m Buy It Now for only: $2.00 |
 U591 59c NON PROFIT 10 ENVELOPE FDC ANDREWS $2.00 Time Remaining: 3h 12m Buy It Now for only: $2.00 |
 U591 59c NON PROFIT ENVELOPE FDC JLP CACHET $2.50 Time Remaining: 3h 13m Buy It Now for only: $2.50 |
 U591 59c NON PROFIT ENVELOPE FDC LORSTAN $2.00 Time Remaining: 3h 14m Buy It Now for only: $2.00 |
 U591 59c NON PROFIT WINDOW ENVELOPE FDC ANDREWS $5.00 Time Remaining: 3h 15m Buy It Now for only: $5.00 |
 U591 59c NON PROFIT 10 WINDOW ENVELOPE FDC ANDREWS $5.00 Time Remaining: 3h 17m Buy It Now for only: $5.00 |
 U592 B 18c EAGLE ENVELOPE FDC ANDREWS $2.00 Time Remaining: 3h 18m Buy It Now for only: $2.00 |