Eagle grips or stocks first became used on Colts in late 1881 or early 1882 around serial # 73,400 and continued during the 1890's. The Eagle grips were brownish in color.
the handle confiruration is different. go to: gunsamerica.com look up colt bisley SAA and then just colt SAA. Note the difference in handle shape. then just colt SAA. Note the difference in handle shape.Also the cylinder frame is different to match the grip frame where they match along side the hammer which is also different.
You will need to call Colt.
If you call Colt, they will tell you.
Your colt was made in 1956.
Proofhouse.com has Colt sn data. If not there, call Colt.
about 1904
This question makes no sense.
SAA or M1911?
Your colt single action army was made in 1906.
Proofhouse.com has Colt sn data.
1903
made about 1928......................