For anyone who is interested, there is more information, pictures showing variations, etc. of the Colt Model 1900 at
http://www.coltautos.com/default.asp. See attached pictures of a similar pistol of the same variation as my 1900. Production dates listed on this site vary from what I previously posted. Here are those numbers: Serial numbers 1 - 1449 (1450 produced in 1900), serial numbers 1450 -3499 (2049 produced in 1901), & serial numbers 3500 - 4274 (775 produced in 1902).
BroGeo