It's unknown. Somebody would have to count them up from the database. Someone I know who had access to the database took a casual glance and estimated there were at least several hundred. That is not a large number for a 63 year old collectible which explains how so few show up for sale. There are 14 on the in-house database here including mine.How many 27-1 3.5 “ were made ?
Pre-27's, 3.5" show up every week on GB, many in pristine condition. The demand outstrips the supply, seems everybody wants one thus driving up the prices.