Bushnell Custom 7x50 and 10x50
The Bushnell Custom 7x50 and 10x50 are very similar in outward appearance. They have the heavy duty Custom style body with twist-up eyecups. They are very well baffled with few extraneous light leakages. The images are very well corrected and the eye relief is fairly good. The only bad thing I can say about these binoculars is that I find them too bulky and heavy. I find the focus wheel hard to reach and my arms tire quickly from holding them. Otherwise, they are excellent binoculars.
Custom 7x50
Mfr: Unknown, marked "BOL"
Date: circa 1970's
AFOV: ~52.5 degrees
TFOV: 7 degrees 30'
Eye Relief: ~18mm
Prisms: high index
Weight: ~1200g
The 7x50 has only a moderate field of view but it has very a good image to the edge with just enough eye relief to use with glasses. I disassembled an eyepiece and found it to be a three element Kellner type as can be seen in the photo above.
Custom 10x50
Mfr: Unknown, marked "BOL"
Date: circa 1970's
AFOV: ~70 degrees
TFOV: 7 degrees
Eye Relief: ~14mm
Prisms: high index
Weight: ~1350g
The 10x50 has a very nice wide field of view. The edge of the field is not sharp but that is to be expected from such a wide angle design. The eye relief is better than average for a wide angle binocular but not enough to use with glasses.