The label, 'Michel-Ange Garini' appears to have been used in instruments distributed by the firm of Jérôme Thibouville-Lamy (but not made by them). No person by that name is listed in any of the important dictionaries of violin and bow makers - it was purely a generic label used to denote a certain series and quality of instrument.
These instruments apparently were commissioned by the firm of Jérôme Thibouville-Lamy (JTL) from another studio in Lorraine, over the period 1900 to 1920. They are generally characterised by an attractive wine-red spirit-based varnish and bear a very simple label, as shown in the photos.
Their objective was to fill the dearth of affordable well-toned instruments in which costs were kept down by employing techniques that resulted in nice-looking good-sounding violins, freed from many of the labour-intensive norms that added little to a violin but loaded the costs. For example, in the case of this violin the purfling is simply marked into to wood, but not actually laid. The 'flames' in the back and sides are in reality a clever manipulation of the varnish during the application to create the impression of rich flames in the wood, whereas a close examination of the details of the varnish show that this is a superficiality. Yet, it works and the impression this creates is of the opulence of highly-flamed materials.
Further, cutting the top and backs in one piece (as in the case of this violin), eliminated the work and effort of gluing two halves together and creating accurate and secure central seams, again lowering costs. Also, the wood in the tops are often of unusually open growth lines - cheaper and at the same time facilitating overtone response resulting in rich tone. The net result of these instruments was simply what they were intended to be - affordable, good-sounding and nice looking - for many students and musicians this is a winning recipe.
The above describes this violin well in every aspect and it serves much as a good example of the 'Michel-Ange Garini' instruments. And yes, it is well-toned, responsive and a pleasure to play on and listen to.