. Hi Ed,
Newport MK II on right side backplate in blue. Also says 10×,50 extra wide-angle, 420 feet at 1000 yards.
Under the right side is the tripod socket. Normal swift type.
Black back plates, grey body, black front rings.
Swift in a circle and crosshairs and also a blue band on the back left plate.
The weight is 1098 g. With the strap it weighs 1122 g.
The dioptre is marked from +2 to -2 dioptres in big white numbers. The whole range is from +5 dioptres to -6 dioptres.
The Ramsden disc (exit pupil) is somewhat squared off but not badly.
There is slight pincushion distortion.
Somewhat poor edge, but not too bad. Good performance.
The hinge on this sample is too loose.
Silver strap lugs.
Amber coated cemented doublet objectives.
The eyepieces are partly Amber coated and partly uncoated surfaces.
The prisms are not coated.
There is a worn silver Japanese sticker.
The large focus wheel is a bit worn on the front.
The eye relief is small.
The field is measured as 7.90° against the claimed 8.02°.
On the front tripod cover it says Japan.
Serial number 7519xx.
Maker JB 56.
The case says Made in Japan. Pat. No. 202358. There is a passed sticker on the bottom.
The case is black and has a strap.
Swift is lightly stamped on the front within a circle.
There are no lens caps.
The total weight in the case is 1608 g.
It is the same Japanese case as the Hoya 10×50, which binocular is from another factory.
The case has a stud closure.
The eyepieces on the binocular are large but not extra large.
I actually prefer the Minolta standard 10×50, which has a 7.8° field of which 7.65° is easily available.
Although the Swift maybe stronger built?