Serial number suffix questions

Great responses guys. Thanks for the all the info that you have shared. This is a great forum and I am glad Thor hooked me up with everyone here. I have learned a lot and am still learning something new every day. I sure do appreciate it. Thanks.

Sid.

p.s. If I am slow to respond it is because I do not have a computer at home and have to rely on my computer here at work to read the posts. Thanks for your understanding.

Sid.