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I bought 5 precanceled postage due sheets last week. There were J69 (1/2c), J79 (1/2c), J80 (1c), J81b (2c), J85 (30c). The J79 and J80 have no gum. The rest have wet gum. Not sure of their value or how scarce they are.
They will fit in well with my postage due sheets that I bought at the post office in 1986 on the last day of sale. I purchased the 1c through the 50c sheets including the 11c, 13c, and 17c.
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Good for you! Could you scan yours? Are any of your sheets of J89 - J99 dull gum? Here's precanceled sheets of J69 and J76.
J69 sheet plate 20241 UL Patterson, NJ precancel inverted

J76 sheet plate 20229 bottom right Patterson, NJ precancel |
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| Edited by postagedueguy - 03/31/2019 5:26 pm |
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Here is a list of what I got from the PO. I did not look for dry/wet gum differences. I wish I could repick over those sheets they had, today. J89 - 1c - wet gum - UL - 35306 J90 - 2c - wet gum - LR - 29229 J91 - 3c - dry gum - LL - 37876 J92 - 4c - wet gum - LR - 27694 J93 - 5c - wet gum - UL - 37877 J94 - 6c - wet gum - LL - 27072 J95 - 7c - wet gum - LL - 35306 J96 - 8c - wet gum - LL - 34283 J97 - 10c - dry gum - LL - 37876 J98 - 30c - wet gum - LL - 35306 J99 - 50c - dry gum - LR - 37877 J102 - 11c - wet gum - LR - 35283 J103 - 13c - wet gum - LL - 35306 J104 - 17c - dry gum - LR - 35307 Here are the others. The J69 I am still waiting for. Seller assured me it was complete plate side before I bid.      EDIT: added plate positions and numbers above. |
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| Edited by jaxom100 - 04/01/2019 01:38 am |
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Pillar Of The Community
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Quote: I added the plate positions and numbers in post above. Thanks for the plate numbers. On the J96 34283 please compare it with one on post https://goscf.com/t/52629 it see if you have the new color. Scroll down until you find the post with the three 8 cent plate blocks.
There are three types of dull gum: J91 37876 and 37877 always has dull gum and have type 1A and J104 35306 and 35307 always has dull gum and have type 1B. Dull gum type 1A tends to make the stamps curl and type 1B doesn't. The third type dull gum is type 2 which is yellow.
Please compare your J97 and J99 with the J91 and J104. If the gum a different color then its yellow. Here's a post that shows the difference: https://goscf.com/t/62888. Just scroll down a bit and you'll find it. |
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| Edited by postagedueguy - 04/01/2019 02:25 am |
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Pillar Of The Community
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Your J97 is the definitely a type II, but I can't tell if its gum type 1A or 1B. If you lay the sheet out flat and it curls then it's 1A. The J99 is type I gum type 1B.
I see lot of inking errors since these stamps were utility stamps and not for general public use. So quality control wasn't really strict.

J92 faint overprint |
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I got lucky and picked up the J100 $1 MNH sheet for $25. I was always wishing that I had purchased the $1 sheet when I bought the others. I paid 25% of face value now. Good thing that I did not buy the sheet from the post office.
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Here is a scan of the sheet. It has wet gum. Position 90 is not missing "D". Looks fairly well centered.  |
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| Edited by jaxom100 - 04/12/2019 7:45 pm |
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Never heard the expression 'wet gum'. Is there another word for this ?
Peter |
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Shiny gum. Term "wet gum" came as counter to "dry gum" meaning invisible. |
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The more accepted term for the gum types is 'shinny, and 'dull'. Scott's use to delineate the dull gums by putting a small letter 'v' after the number i.e. J93v, but for some reason they stopped. Now that just have a listing as 'dull gum' with the price for a single.
The dull gum variety was dry printed by the web-fed Cottrell rotary press on pregummed paper rolls that were gummed before printing while the shiny gum variety was wet printed by the web-fed Cottrell rotary press on ungummed paper rolls that were gummed after printing. 800 stamps were printed per rotation.
As to the missing 'D' in DOLLAR it only occurs on the lower left sheet position 90 on 34283/35282 plate pair. I haven't seen it on any others, but everyone please have a look at your J100 lower left sheets.
Plate 35283 was first sent to press on 1974/07/10 and cancelled on 1978/03/30 after 251,889 impressions. Plate 35282 was first sent to press on 1977/09/10 and cancelled on 1987/11/12 after 112,444 impressions. I know the plate for 35283 was broken and retired. So it must have been broken sometime before 1977/09/10 (this was before dull gum paper was used). Then it was replaced by 35282. Plates 34283/35283 were paired when printed. After 35283 was retired 34283/35282 were paired and this lead to the new color on these postage dues. Please see https://goscf.com/t/52629. |
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| Edited by postagedueguy - 04/13/2019 6:59 pm |
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Wow, that was real informative. Thanks.
What about the $5 sheets, anything special to look for? What about the $5 pre-cancel sheets?
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Quote: Wow, that was real informative. Thanks.
What about the $5 sheets, anything special to look for? What about the $5 pre-cancel sheets? Actually the $5 postage due has no varieties other than shinny and dull gum. There are no varieties in the denomination overprint. All positions on all plate numbers exist for both shinny and dull gum. The plate numbers used were on shinny gum were 26291, 26292, 26660, 26661, 27072, 27694, 27850, 27851, 29228, 29229, 34283, 35282, 35283, 35306, 35307, 37876, and, 37877 and on dull gum were 34283, 35282, 37876, and, 37877. The tough numbers are 26291, 26292, 27850, 27851, 35282, and 35283 on shinny gum and 34283 and 35282 on dull gum. The two different color types, carmine rose and carmine brown, exist on the $5 postage due as it does on the 2, 3, 5, 8, 10, 50 cent, and $1. Please see https://goscf.com/t/52629. 
J101 sheet 35283 UR

There are of course ones that are off center. |
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| Edited by postagedueguy - 04/18/2019 6:57 pm |
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Replies: 15 / Views: 1,759 |
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