Hi There,
Here is my take on the info you need, other members will be alone to agree or disagree later........
Lincoln Jeffries ( probably Millita pattern).177 Date = around 1900-1905 ish
Value £100-£145
Webley Premier, working - polished and Nickle Plated £85
BSA Scorpion Pistol, adapted for shoulder stock etc etc £90-£110
Hope that is useful, however all prices offered 'sight unseen'. Clear good quality photos would get you more accurate price estimates.
All the best
Lakey