a) caliber - 38 Special
b) bbl length - 4"
c) grips shape (round or square) - Not sure on this one, grips seem "standard" - smooth curves at the front and back, but flat on the sides. Not sure if this is helpful, but the right side has a "normal" arch to the grip, and the left side has a "U" shaped cut out. Also, there is a screw on the frame that is below the center of the cylindar.
d) number of shots/cylinder bores - 6 shot
e) type of sights. - fixed front sight, with a "groove" along the top, that goes the length of the cylinder.
f) serial number, and if there is a letter in front of or anywhere near the s/n on the bottom of the grip - no serial number on bottom of grip, number 225XX on "swing arm" of the cylinder, and then the same 225XX on the frame where the cylinder attaches, but there is an offset "7" above, to the left.
g) Model number if it is under the crane. "CTG" is on the barrel. Wait, now I've found it: C3079XX
That number, if it is the s/n, should come from the butt of the grip (or under the barrel or face of the cylinder).
This is a great topic, and I really appreciate any help you can give me. As you can see from my description, I'm far from an expert. Thanks, -Hawkfan