bought at the flea
(http://i1192.photobucket.com/albums/aa331/skylab2011/mystuff31016.jpg)
That top one's interesting. I wonder what the "18" and "21" stand for? Certainly not a metric measurement, since they bear no relation to the (presumably fractional inch) "3/8" and "1/2".
Can't help, but I'm really good at wondering.
Top one kinda looks like a machine wrench, in which case the numbers may refer to a tool number specified in a parts book (tho 2 numbers is kinda weird)
Bottom is a Bonney standard carbon steel S-wrench owned by Homer :)
I was thinking the top one is an engineers wrench.