"I" frame?
The serial number beginning with "I" may indicate it is an "I" frame. The "I" frame was a precurser to the "J" frame and was essentially a small frame revolver in either .22 long rifle or .32 S&W (Long).
The "I" frames date from the early part of the last century and were popular for their convenient size and weight.
We have now exhausted my information.
I must confess, when I saw the title "92 S&W CTGE" I was wondering when the riot would form in preparation for being the first to buy one.