jdowd,
Welcome aboard.
Presuming you mean Models built on the I frame, there's four possible models of I frame for those serial #s since they each had their own serial # ranges:
1st Model .32 Hand Ejector I frame began in 1896, ended 1903.
2nd Model .32 HE and .22/32 began in 1903.
.38 Regulation Police began in 1917
New Model .22/32 began over again in its own range in 1953
The last three serial # ranges all ended in 1968, although the models continued in new serial ranges that included a letter digit.
So it depends on which model you want to know about