close Les, the same optional signal unit was used 55.2 thru 59, they weren't standard until the 60's, not sure which year

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics