Abalone Alpaca Sterling Silver Mexico Signed Jose N 5 N5 Vintage Brooch

This listing is for a vintage Alpaca Sterling brooch signed Mexico, Jose N5. It reminds me of a sunflower with abalone tile pieces. There is a signature on the back of the brooch. Please look at the photos of the back of the pin. The pin back is tight, but I wonder if it is missing a roll over clasp? It measures approximately 1 3/4" across. I will include a velvet dust bag for storage and a cleaning cloth for removing tarnish in the future. Buy with confidence careful packaging promised. I love to bundle. J Bin 3