First Time Posting Here - I've Bought A .303 But What Scope Is This?

[tiriaq]

The rifle is fitted with a Central mounting plate and target rear sight. The Central sight could be used on a variety of rifles, by installing the appropriate mounting plate.
These are vintage sights, but work very, very well.
The little lens will be to sharpen the sight picture. Some shooters have lens holder eyeglass frames to accomplish the same thing.
A more sophisticated system involves an adjustable unit mounted in front of the aperture. As shooters age, these devices can make a real difference.
A lens can be used in the front sight to sharpen the its image.
A lens could be used with either the front sight or the rear sight, but not both. If there are front and rear lenses, a Gallilean telescope is created which produces magnification. Such arrangements have not been allowed for competitive target shooting for a long time.

Information

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[Doc Martini]

Here's a page from Jim Sweet's "Competitive Rifle Shooting" 5th edition 1961.
There's lots of info on the web about Central sights also.
Could you include some more photos of the rifle, in particular the date stamps on the right hand side?
Attachment 100553