Hi We have here a few bits from a carburettor from a 1936 FIAT Topolino.  There is the top of the float chamber, SOLEX, but the casting is broken, there are bits that can be used 9ncluding the brass nut with the plunger, and also there is the float.  The lettering on the top is ALTO - DESSUS - SOLEX - 12 GP .5, it is 4.5 cm in diameter.  I always combine postage.  Parts for this car are very rare and I have suggested a price of £20, but I have no idea what his lot is worth.