Hondo44: The bbl is 6" The flat on the bottom of the bbl has letterB and then the six serial numbers
that are the same as on the inside frame grip. There is a 4 digit number on the flat of the of the frame where the crane closes.
The bottom of the grips has area the appears to be where the numbers were ground off. I took some pics but don't have a camera
that will show that clearly up close. From what you have said I don't know now what I do have.
What is the significance of the letter "B" in front of the 6 digit serial number on the frame where the crane meets?
Gaffer,
1. Kit Guns all steel models only have 4" barrels and after the war 2" barrels. Only target models have 6" barrels. Now that your photos
cleared that up, we know your gun is originally configured!
Even the serial number; there was no serial # ground off the butt because on this model with target grips and a few others that have grips
covering the grip frame butt, the frame serial # is placed on the front grip strap as is yours, instead of the butt. However, if you meant the
bottom of the left side wood grip, for your serial # 207970 it's very likely to be one of the first 3000 of this model assembled, therefor should
have 4 digit production sequence # stamped in the wood. It reads correctly with the gun lying on its right side and the muzzle pointing to the left.
Can you make out any vestige of a number with a magnifying glass and good, bright light, probably beginning with a 2?
A 'B' in front of the barrel serial # indicates the gun was originally produced with a blue finish.
The matching 4 digit # in the frame 'yoke cutout' and on the yoke are factory assembly parts matching #s and of no other use now,
but they also match the number on the inside of the side plate.
So you have a righteous .22/32 Heavy Frame Target. Congrats!