Likely that seems reasonable.
If the scope is an original WWII DDX and relatively clear it is worth about ~ $400-600 USD. Reproduction mounts are worth about $150 USD.
However, if the scope is non-functional or foggy it would be worth significantly less and the same goes if the scope is a reproduction.
Original bases go $1000 USD + any day of the week, so it is really hard to say without pictures.
The above quotes are not hard prices, with any type of collectible, prices seem to jump all over the map, the above rough quotes are realistic averages IMHO.