Meyer 734 semen could be worth several hundred dollars a straw... 734 was a homozygous black, horned purebred Simmie bull that clicked great with Angus cows and made really attractive half bloods. He was a baldy with stocking legs and a white belly and tail...he made a lot of baldies before baldies were as popular as they are now. He also happens to be the sire of 3C Macho, Picasso, Whiplash, and several other bulls. There seemed to be a run on sons after 734 died as people tried to replace the bull with a baldy son that might do the same thing. Macho has been by far the most popular one to surface. If what you have is 734, you definitely have something. If it's anything else, I'm not sure.
I looked on the database and did see a Meyer 745, but I'm not familiar with that bull. The 735 Lautner bull that buckeye posted the link to is a Macho son, so he'd be a grandson of the original 734 bull (ASA 1390632).
I'm pretty sure I have a pic of that bull that I've used in sale catalogs as reference...I'll see if I can attach it here. He wasn't pretty, but he did make some pretty half bloods! If that's what you have, you may either want to sell it or save it for flushing Angus cows! It's probably worth too much $ to make calves one at a time anymore and risk getting nothing.
Here's the pic...