Snaquebite,
If you get a chance, give this book a look through for your M1 .....
http://www.brownells.com/.aspx/sid=5...000007_d_10210
I use it often for mine and any one else who is a Garand enthusiast.
The book can trace every serial number on every piece from the "born date" on upwards.
It can't help with the appraisal part, but can help you get a better "feel" when you do take it to an appraiser and they're not jerking your chain.
Hope this helps some.