Need Help w/ Colorful Crochet Bed Spread

hi everyone. i found this piece last week and finally was able to take some pictures at a place i have access to with room to lay it out and shoot it properly. I believe this is crochet(but i'm not sure). also, i think the yarns are cotton, but again, not sure. it measures 84" x 90" approximately. i think it's an eyedazzler. what i would like to find out is, it's approximate age? i'm assuming this is probably from the last 50 or 60 years, but i don't know for sure. also, i would really like some feedback as to how much time it would take to make one of those squares? there's a total of 210 squares that measure 6" x 6". i would love to come up with an approximate number of hours that went into making this. also, is there a specific name for this design? a specific name for the type of crochet work? really any information someone with knowledge in crochet has to offer will be greatly appreciated...thanks