I am looking for an insurance company known as Protective Home Circle from the 50's my father had a life insurance policy with them. I am having trouble locating this company. Thanks for your help.

You've got two decent bets (I searched two databases and didn't find it) – first, see if there is an issuing agent's name and/or address on the policy, and see if you can find it that way. Second bet is to contact your state insurance department, see if they can track it down.