Many think that the MAFAC/Spidel LS brakesets were made by Modolo as they have similar shapes. (I own both Modolo and MAFAC/Spidel LSX brakesets).
I do not think this is the case as the LS2 and LSX brakesets were included as part of the Spidel component Groups that were meant to showcase ONLY French made top line components. (That was the whole point they conceived the "Spidel" brand).
If you take off the hoods from these LS levers you will not find the typical flutes on the cast aluminum lever bodies that Modolos always have, regardless of what brand they re-branded their brakeset for other companies like Mavic, Edco and Sachs The lever bodies also do not have the blocky sharp corners of the Modolo lever bodies. I do not think a Modolo 919 lever hood will even come close to fitting over the MAFAC lever bodies which are a totally different shape, much more similar to Campagnolo record lever bodies.. Also, on all re-branded Modolo brakesets, you will always find the Modolo brand name still on the component either hidden or in smaller fonts not easily seen at first glance.
The calipers on the LS brakesets are also usually mistaken for Modolo products as there are similarities in shape. but if you look at LS calipers closely and compare them to all Modolo sidepulls, they are quite different in shape profile and section through the caliper arms plus the quick release mechanism is totally different on the MAFACS in design and materials.
The pivot bolt head design is also different with the MAFACS having a a unique looking bushing at the base of the bolt head with a knurled section on it that is never present in any Modolo caliper. The LSX calipers also have a very unique mounting bolt design where it is an actual full allen headed bolt that is screwed through the back of the fork crown, onto a threaded hole at the back of the calipers. Also, totally different from all Modolos.
It is not surprising that the two different brand brakesets might be similar looking because you can only really design sidepull calipers in so many ways and component manufacturers did copy certain characteristics of other company's designs, regularly. Who copied who, sometimes we will never know.... Maybe.....a former Modolo Engineer was hired by MAFAC at one time....or vice versa??