S & K Scope Mounts in western PA makes one for the Eddystone http://www.scopemounts.com/ Look under "Insta Mounts"
Weaver
your eddystone is usually referred to as the model 1917 eddystone in caliber 30/06. your rifle was made in 1918.....................................
Check with local gun shops
50-500
Remington made 646,000 US model of 1917 rifles for the goverment during world war I. Winchester and eddystone also produced rifles for the U S goverment during that time,with eddystone being the largest producer.
made December 1917
valued depends on overall condition, both luger and eddystone
300-750 dollars depending on the amount of original finish remaining on the rifle,and the stock and a good bore.
100-800 usd
The Model 1917 U.S. Rifle made by Winchester is worth about $800 to $1000 in excellent condition with all original parts. Much less if it has parts from Remington or Eddystone and has gone through an aresenal refurbish.
made June 1918
By comparing the serial number to published charts. sales@countrygunsmith.net