Identification is a process of elimination, not recognition. Very few weights announce themselves. Most are narrowed down by a series of small observations, none of which is conclusive on its own.
Start with the base
Turn it over before anything else. The pontil mark, where the working rod was broken away, may be ground flat, polished, left rough, or hollowed. How it was finished is a workshop habit rather than a design choice, which makes it more useful than most of what you can see from the top.
Then the canes
If the weight contains millefiori, look at the individual canes rather than the overall pattern. Close packing was common to all the major French houses of the classic period, so the arrangement narrows nothing. Particular cane types sometimes do.
Look for a signature cane
Some makers set a small initialled cane into the design. Where one is present, the attribution moves from inferred to documented. Where one is absent, nothing is disproved: signed and unsigned weights left the same benches on the same days.
Be willing to stop
The most common honest answer is that a weight is of a type, from roughly a period, probably from a region. That is a real answer. Probably Clichy and Clichy are different claims, and only one of them should affect what you pay.