This will answer the Sunbeams question

http://gingermeggs.com/2014/03/12/a-letter-from-ginger-meggs-to-a-sunbeam/

The enamel pin is simply a simplified crest from the Coat of Arms of the City of Melbourne. It would have been a souvenir and could be any date, probably mid to late 20th century. When you asked this question in September last year the photo you showed looked to me more like part of a cuff link.

http://community.ebay.com.au/t5/Coins-Stamps-Collectables/Can-Somebody-Help-Please/m-p/1856393/highl...