Marrakai,
Interesting your Rigby has the flat lever as well. As for more info on your Rigby , I have records from EAP which lists various Rigby rifles and the owners , sometimes I can locate game licenses the owners had . For example I have WDM Bell's Sportsman's Lic records and info on his Lee Speed , Mauser and double rifle license from 1905 . The records I have range from 1905 to 1925 . If you care to share your Mauser number and Rigby Number I can look it up for you . Not saying it will be there, my 1924 Rigby isn't . There's a wealth of info I have eg William Buckleys Lic , the appointment of Jim Corbett to game warden Nairobi .
Cheers
BJ