Wow, I was in high school then and working at Kroger as a sack boy, ha.I believe I paid $62.50 for my 1973 Ruger [in 1973] shown in another forum here.....but, I was earning about $125 a week.
So, about 1/2 a weeks pay.
Do the math..
If memory serves me, '73 was a big year for the BH as they started adding the transfer bar and instead of the three screws holding frame together there were two pins. May I ask if yours was one of the new models with the changes or actually made prior to that and uses the old configuration??
I have a '67 model but it has had the transfer bar added later for safety.