Signal Transformer Co. model 24-8 transformer, new/surplus.
The primary is rated for 115VAC and the output is rated for 24VAC 8A or 12VAC 16A depending on wiring.
These are new/surplus transformers, freshly removed from the manufacturer's original packaging.
To download a full specification sheet,
Approximate dimensions: 4"x4"x4", about 8lbs.
Step down transformer, 115VAC to 24VAC 8A or 12VAC 16A, Signal Transformer model 24-8 $29.50