Short answer is NO ONE KNOWS. At a well attended auction two bidders may both want something only one can have. At a yard sale a rusty greasy old motor may go to curb at end of day. Most old outboards are
missing some cosmetic item or other like a gas cap or rubber grip which have a great effect on value as replacements are costly.
A stuck missing parts example might go for 10 to 25 while a complete
restored or original would be in $100 plus range. Shipping costs are
very significant considerations. Even a great looking motor can have
defects unknown to seller and buyer. Sold AS IS so buyer has to stay
in WHAT I CAN AFFORD TO LOSE price range,
Louis