Mine on my new to me 10-8 is (well it LOOKS like) because the top three digits roll mark is not clear on the top of the three digits!

C25
034xx

I think you are looking at assembly numbers that have no meaning after leaving the factory.

What is the number including any letters on the bottom of the grip frame?

Thanks I'll have to look

In answer to your question about a list of serial numbers.

You need to obtain the Standard Catalog of Smith and Wesson
3rd edition.

It is the Bible of S&W from the "git-go" to the present.

If you provide the serial number with the last 2 or 3 digits X'd out, someone will look it up in SCSW and provide you with the closest dating info readily available for your gun.

That is about as close as anyone can come without you requesting a letter ($50) from S&W.

The fact that your S&W is a 10-8 tells me it was manufactured later than 1977 for a start.

Thanks Iggy! I'll look tonight and get he serial, but I will pick that book up as son as I can.

If you go out and buy the Standard Catalog of Smith and Wesson
3rd edition, I say its a book that you will read almost everyday.