Bound Concertina, unsupported![](https://3.bp.blogspot.com/-Xli7pk-rwnk/Vtdri33Wy3I/AAAAAAAAOyg/3jYkN7SmGaA/s320/340.jpg)
I had an example of a bound concertina with a supported sewing just a short time ago (
Book 332) and this is now the follow-up book using the same idea of sewing signatures to the mountains of the concertina, but this time with no spine support.
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