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<p>[QUOTE=&quot;Ce BCA, post: 4333614, member: 18716&quot;]Thanks for the extra details, it&#039;s one of those messy areas which seem so common to jewellery.&nbsp; So it looks like it&#039;s possible the trombone clasp was invented in the 1850&#039;s, and most sources suggest it wasn&#039;t commonly used until the 1890&#039;s and then fell out of favour in the mid 20th century (this is what we see as jewellery sellers).&nbsp; In addition it has continued in use sporadically since including by some designer brands including Tiffany which is interesting.</p><p><br /></p><p>This means it not a great feature for dating without other evidence.[/QUOTE]</p><p><br /></p>

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