WWI COLLAR DISK TM TANK COASTAL ARTILLERY SCHOOL

WWI US Army Collar Disk lot to include 1) Coastal Artillery Collar Disk maker named to the reverse U.S. Specialty Company New York complete with post and screwback device. 2) TM or Trench Mortar Collar Disk complete with post and screwback device. 3) First Pattern Tank Service Collar Disk with front view of the Tank. Complete with post and nut. 4) Variant Service School Collar Disk complete with post and disk.