-------- Original Message --------
Subject:        RE: invisible stamps
Date:   Thu, 5 Sep 2013 07:37:24 +0000
From:   Brendan Whyte <[log in to unmask]>
To:     mapsL <[log in to unmask]>



Regarding embossing stamps

The Parliamentary Library of Australia (now the National Library of
Australia) used to use these. The stamp featured two concentric ovals,
with our name written in between.
We are finding now (50-100 years on)  that on some maps, this had acted
over time like a hole punch, and we have a number of maps with oval holes...

Stamper beware!



Dr Brendan Whyte

Assistant Curator of Maps
National Library of Australia