From the Hammond 1750 output transformer series, this is listed as a drop-in replacement for a Fender Vibrolux Tweed, 5F11  -  they're supposed to look similar to the original Fender transformer where possible.  That being said - this sticks out like dog’s balls when mounted on a crusty old amp. 

Materials etc are also supposed to be similar to get as close as they can (within reason I suppose).

It was a bargain, at $76 +GST (Australian dollars) from Mouser, including free delivery.  Like all things Hammond, it feels well made.  

• 8,000 ohms plate to plate
• 16, 8 & 4ohm secondary windings (these options would not have been on the original)
• rated at 15w
• bobbin wound

Turn Ratios

4 ohm turn ratio     44.77  (2004.35)

8 ohm turn ratio     31.58  (997.29)

16 ohm turn ratio   22.38  (500.86)

Frequency response

75hz to 15khz  

Inductance

19.66H

HAMMOND 1751M OUTPUT TRANSFORMER DATASHEET

HAMMOND: 125SE Output Transformer Data

Yes, this is super nerdy and I may be the only person that will ever find it useful - I combined the specs from the Hammond 125SE series into one table, as I found it really annoying to check through individual datasheets.

I recently installed one in a Vox AC4-C1 12 just to see if changing the transformer would improve the amp.  Short story, yes it did.

HAMMOND 125 SERIES, UNIVERSAL SINGLE ENDED OUTPUT TRANSFORMER

A direct link to the table can be found here