British Army Issue Bino's?

[GasMasksUK]

Heres something from my dads childhood, he got them from an army surplus shop.

Markings:

BINO PRISM No5
MkIVa
x7

1943

theres a few more symbols on them.
So does anyone have any info on them?

Thanks

Danny

[big ned]

Hi Danny,

The bino's you've got are engraved'BINO PRISM No.5 Mk4, x7,GRATICULES 1/2 degree APART AND 1/4, 1/2 AND 1 degree HIGH.'

They are based on the Ross 'Stepnite' design of 1930. They have individual eye piece focusing, and ports for nitrogen purging, to prevent moisture or mold build up. The resolution is 7 x 50.

Although probably not maker marked, they were almost certainly made by the Ross Optical Co. at 'The Optical Works, Clapham Common, London S.W.4.'

Their value is between 10 - 35 Pounds depending on condition.

Hope this helps.

Regards, Ned.