Found this on Etsy. Not mine
https://www.etsy.com/listing/619096656/motorcycle-pin-by-vespamikey?ga_order=most_relevant&ga_search_type=all&ga_view_type=gallery&ga_search_query=motorcycle+parts+RD400&ref=sr_gallery-1-2&organic_search_click=1
Cool little Geneva Green '76 custom! :thumbs: (description incorrectly lists it as a '77)