Recently acquired, a scarce set by maker R. Wass from Sheffield (another of his here: https://straightrazorpalace.com/show...rge-damer.html). This one is the "Jubilee Razor" and is possibly for George III's Golden Jubilee in 1809. A paper insert is included that has some instructions. Robert Wass had a patent for "certain improvements to razor handles", and this may be what that patent is talking about. The handle is a spring-knife style, and clicks into either position - like the paper says, it really does change the weight at the blade end by changing the balance.
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Best of all, there are two of them! Until today at least, one of them is now on the way to another collector.
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