I have some that are 40 years old, some that are a couple years old, most American made but a sprinkling of good quality Chinese and almost worthless el-cheapo ones from who knows where.
I have from 6" to 1" and once bought a new one, usually 4", when I walked by them at Lowe's, every few weeks.
I recommend some 2" and 4" with a few 6" for clamping the handle section to your table. if you are going to be at this bow making stuff for a while buy American. The ones that break on me are always Chinese, never broken an American c-clamp.
I have about twice as many now as when I took this picture, made the table for glue=ups and to store my clamps, real handy.