Well the pictures aren't very good for what ever reason, so it's hard to see whatever work might have been done around the forearm or lock wood (as the invoice mentions).
Also, one of the inflation calculators says $150 in 1966 would equal about $1025 today, and not likely would you get that much work done for that amount today. At least not well done!
I wonder what the owner paid for the gun in 1966? I'll bet it wasn't much more than the repair bill!
John