Schon used that pin in the early 90's. So that dates it. As for the model you need to post pics of the whole cue. You can also check in the Schon archives on their website. www.schoncues.com You can also contact Evan Clarke through the website and he will ID it for you. Be prepared to wait a couple weeks for an answer though.
I believe this pin was used around 1993ish for one year only. Nice looking cue. Email Evan and be patient he will get back with you and give you info on the cue.