A new detail emerges in the history of singing bowls

I have added a detail to the history of singing bowls. I have for years noticed these transitional pieces which seem to retain elements of earlier bowls. One type is pictured, which I date as a mid 18th century - early 19th century type, yet some of them have an attempt at an older technique from the 16th century and earlier. They did not get it right, as this one shows, but their masterful attempt is as difficult of a technique. I’m referring to the shape of the rim. In earlier singing bowls, the metal is folded at the rim to achieve a very symmetrical and beautiful form. This method was lost but some makers, like this one, seem to have tried it their own way. They did not fold the metal, but just gathered it more thickly around the rim. The interesting thing to me is this maker may not have known the older bowls were folded. The technique is not apparent until the metal begins to unfold, which does not seem to happen for hundreds of years. So this bowl was made by looking at bowls that had not yet shown the secret of their construction. Perhaps if he knew about it, this maker would have also folded the metal. Or perhaps this was the closest he could get to the folding technique which is still considered a lost art.