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Valued Member

Japan
36 Posts
Posted 06/05/2018   10:12 am  Show Profile Bookmark this topic Add JPR to your friends list Get a Link to this Message
Can someone tell me how to distinguish between old stamps with their original gum and those that have been regummed? I may have stamps that I always assumed had their OG, but never knew the difference. Please post pictures if you can. Thanks.

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Pillar Of The Community
Norway
1660 Posts
Posted 06/05/2018   10:33 am  Show Profile Bookmark this reply Add Blaamand to your friends list  Get a Link to this Reply
Regummed will normally show gum at the edge of the paper and inside the perforation holes, will need good magnification to detect it. Most stamps were gummed before being perforated, and hence will not have gum at the edges.
Additionally the color/appearance of regummed will often be different from original gum, don't have any images available right now.
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Edited by Blaamand - 06/05/2018 10:36 am
Pillar Of The Community
United States
890 Posts
Posted 06/05/2018   10:44 am  Show Profile Bookmark this reply Add chipg to your friends list  Get a Link to this Reply
This will give you a start:

https://www.hgitner.com/regummed-stamps.html

Familiarity with the right gum for the right issue will also help.
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Pillar Of The Community
1683 Posts
Posted 06/05/2018   10:47 am  Show Profile Bookmark this reply Add rogdcam to your friends list  Get a Link to this Reply
Gum on perf tip fibers. Crackled gum.
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Valued Member
United States
121 Posts
Posted 06/05/2018   4:41 pm  Show Profile Bookmark this reply Add codehappy to your friends list  Get a Link to this Reply
The old giveaways were things like gum caught in the perf tooth fibers, gum bleeding onto the front of the stamp, gum of uneven thickness or incorrect texture, or gum that's the wrong color/type for the issue.

Unfortunately, modern sophisticated regum jobs have none of those "tells". The gum used is authentic gum taken from another, cheaper stamp of the same period and country. The gum is applied to the back evenly with the perf fibers embedded in a substance (like soft clay) which prevents the gum from leaching to the front or getting caught in the fibers at the tip of the perf teeth. The gum is applied using a brush or roller in a manner that is correct for the issue, so the gum will have the right texture. That was the state-of-the-art about 20 years ago, I'm sure they have other tricks as well by now to help them escape detection. Regums done this way can be very deceptive, and accordingly often come with certs saying "full original gum MNH", or expertiser's marks on the back for countries like Germany that value such marks on the back.

Don't trust gum.

EDIT to add: This is one of the cases where an old certificate is better than a new certificate. If your classic MNH stamp has a 1975 cert saying "full original gum", you can be more confident (not totally confident, but more confident) that it's not a modern regum job.
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Edited by codehappy - 06/05/2018 4:43 pm
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5438 Posts
Posted 06/05/2018   4:51 pm  Show Profile Check 51studebaker's eBay Listings Bookmark this reply Add 51studebaker to your friends list  Get a Link to this Reply
Today gum is often air brushed on and if well done can be deceiving. (In the past, a good regummer would 'pot' the stamp in clay and protect the perfs.) On some stamps the 'curl' test can be used, place the stamp face down in the palm of your hand and allow your body temperature to heat the stamp. If the stamp has been regummed, the stamp will often curl. I assume it curls do to the uneven temperature changes with any additional gum layers that have been applied.
Obviously this is a not a fool-proof method, but can sometimes give you another piece of info for a decision.
Don
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United States
1743 Posts
Posted 06/14/2018   9:52 pm  Show Profile Check eyeonwall's eBay Listings Bookmark this reply Add eyeonwall to your friends list  Get a Link to this Reply
it is a mismatch in stress (either expansion on heating or shrinking on cooing) between the gum and the paper
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United States
3071 Posts
Posted 06/15/2018   12:34 am  Show Profile Bookmark this reply Add redwoodrandy to your friends list  Get a Link to this Reply
thanks
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