The scarf weld is fairly apparent. There were definitely lathe screw threads of size well before the Victorian age and certainly in the 18th century. If you have, or can borrow some thread gauges (look like notched feeler gauges), a clear match might place it to a standard thread pitch, tpi, etc.
By the mid 18th century, there were some standards for interchangeability.
Cheers
GC
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