Greetings, Michael. It's really hard to track down silver rounds without the private mint's mark engraved somewhere on the item itself (or the original packaging which would identify the source). There are many variations of that particular Marilyn Monroe silver round. In fact, this is the closest match on Numista: N#136881
(Notice how similar the obverse side is to yours, but the reverse side is very different.)
Side note: the admins typically blur coins which have explicit content on them as a default setting.
One option (and this is what I would do if it were me) is to visit an LCS (Local Coin Shop) in your area and show the silver round to the coin shop owner to see if he happens to know who made it. Coin shop owners deal with a ton of silver rounds -- especially now since the price of silver is still high. Sometimes people sell their silver rounds to a coin shop with the original packaging still intact. So you may get lucky in finding the source. But this one looks really old. So it won't be easy.
