Help dating and caring for Morris Moskowitz purse

Wondering if anyone has an idea of date. I know that dooney and bourke discontinued the line in likely lste 80's. I did find an identical latch type on one of his 60's purses, but wanted to get some confirmation. Also what can i use to clean this? I gather that capeskin is lamb skin. I want to add this to my personal collection and want to protect it from the elements. Thanks for any help!