looks like you have the bay shetland pony #23. this lil guy was produced from the early 70's up until the late 80's. as for a price check, i'll get back to you on that, as i haven't made any breyer purchases in a few years and i'm not updated on pricing.
//alright after a quick search, he'll go anywhere from $4-$12 depending on condition. your's looks fairly nice, so i'm sure he'd be around the upper end of that. if anyone can back me up or correct me, please do!