Wilco...currently in KLGA...and for the record, it ran for 60 hours as advertised (keeping excellent time) as of 1025 LT today...however, it really started to significantly slow down between hour 61 and hour 62...regardless...good times!
馃憤
NOTE: Yes, I see the fiber debris in the movement.
馃槻
The Illinois Bunn Secial 60-hour movements were marked in three different ways. Type 1 was marked MOTOR BARREL 60 on the barrel bridge. Type 2 was marked SIXTY HOUR BUNN SPECIAL on the train bridge, and MOTOR BARREL 60 on the barrel bridge. Type 3 is marked SIXTY HOUR BUNN SPECIAL on the train bridge, and MOTOR BARREL (without the 60) on the barrel bridge. Yours is type 3. Many collectors prefer the type 2 because of the double marking, and these bring a small premium. Yours was very late in the production of Illinois watches by Illinois. Hamilton Watch Co. bought Illinois in 1928. While Hamilton experimented with production of a 60 hour movement, they were never successful. I suspect it was partly because of Illinois' success with the 60 hour movement, that Hamilton bought the company.
Type 3 models (like yours) began with S# 4,894,001, and ran until S # 5,255,000, and were produced between 1926 and 1930. After S # 5,282,001, and until S# 5,441,200, they were produced by Hamilton.
This information from American Pocket Watches-Illinois Watch Co. Encyclopedia & Price Guide, William (Bill) Meggers & Roy Ehrhardt. ISBN 0-913902-34-9, now out of print.
Beware! This sort of minutiae can really become a habit!