The Rigby Company name has gone through several changes which affect the price significantly. I don't know the history well enough to say which ones are more desirable.
The rifle you described sounds like an oddball as most Rigby's have a straight bolt that can work with scope mounting. I have not seen any that used the military safety as is so this could have been at the request of the original buyer.
If I can't find comparables on the internet at places like Champlin's and Hollowell's I have had the rifle or shot gun appraised before purchase. Or if possible I see what offer a reputable gun shop would make to buy the rifle.
"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
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