My great grandmother was born in 1892, and she knew a lot of boom and bust in her life. One day she asked me to help her go to the bank to get cash for grocery shopping. The bank turned out to be her mattress, under which she had piles of bundled bills, probably about $100k in 100s and 50s. plus a lot of silver and gold coins. She handed me a bunch of 20s and the grocery list and told me to keep my mouth shut and I could have some of her beer...
She was very good at saving money, and must’ve really trusted you. $100K from 1975 in today’s money would probably be well over $400K.