[R-1051] different J4 connectors on rear - E to F or G model?

[Nick England]

You learn something new every day - I just noticed the J4 connector on the
rear of the earlier R-1051 models is different from the later ones. I
wonder where this transition occurred. I don't have photos of the F model,
but one style was used up through the E model, and a different style for
the G and H models.
E model
http://www.navy-radio.com/rcvrs/r1051/r1051e-1509-03.jpg
G & H models
http://www.navy-radio.com/rcvrs/r1051/r1051h-1709-05.jpg

My other R-1051 info and photos are at
http://www.navy-radio.com/rcvrs/r1051.htm

Any help, comments, corrections?

Nick England K4NYW
www.navy-radio.com