Rifle sights

[pendle]

Hi does anybody know what these sights are. A mate just sent me a picture. Aimpoint type
Off one of his air rifle

 

[truser00]

As written on the top, a BSA RS1 sight. The rifleman.org.uk has some details on it: BSA Airsporter Mark IV

 

[pendle]

As written on the top, a BSA RS1 sight. The rifleman.org.uk has some details on it: BSA Airsporter Mark IV

View attachment 412646

Cheers I looked for it but too me to YouTube
And other sights