Steve:

If you tell us the serial numbers of your Bunn Specials, we'll probably be able to tell you if they're fitted with sixty hour mainsprings or not. The one marked "Motor Barrel 60" has a 60 hour mainspring.

If you are going to collect Illinois watches, you might consider getting a copy of "American Pocket Watches Vol. 2, Illinois Watch Co., Encyclopedia and Price Guide,"
William Meggers, Jr. & Roy Ehrhardt, Heart of America Press, Kansas City, MO, 1985
(still in print - see http://www.hoapress.com )

Kent