1, 2, 4, 12 – Canadian. Depending on markings either WWI, WWII or post WWII. If marked on the scales as M&D Canada then WWI, Case XX Metal Stampings = WWII, M.S. Ltd = 1948,1949, Case XX Stainless =1950-1965. Some of these could be British made substitute patterns for the 6353/1905, need to see the markings.
3,6,10,11,18 – Pattern 6353/1905 This was the basic Army issue clasp knife for WWI. Issued with a white cotton lanyard. The lanyard was worn looped around the right shoulder with the knife carried in the right breast pocket of the tunic. Is pattern was in service from 1905 to 1938/39.
5 – Need better pictures – The only 6353 pattern with bone scales I’ve seen are the Camillus or Schatt andMorgan made ones for a Canadian contract. Should be stamped on the main blade ricasso with a three-line stamp. If not Camillus would like to see markings.
7 – Navy issue clasp knife in service 1940-1986. Most made by Rogers.
8 – WWII style Army clasp knife, probably Indian manufacture. The ones in my collection with the rather thick horn scales with somewhat crude hand done checkering are Indian. Same pattern as the British knife but made in India. Most issue knifes for the Indian Army (part of British forces until 1947) were locally made.
9 – Post WWII Army issue. 1952 or later. Should be stamped with date and possibly NATO stores number.
13 – Belgian post WWII copy of British WWII knife. Belgium used mostly British style military equipment including web gear in the post war era. ABL is the abbreviation for Belgian Army.
14, 15 – Two variations of the Admiralty Pattern 301. This Navy issued knife was in use from early 1900s until about 1939. Replaced by newer style like No. 7
16 – Look like the WWII pattern but is a bit large, might be commercial pattern, need to see markings.
17 – Boer War period knife. Often found with soldier’s service number branded into the scale. Replaced by Pattern 6353/1905.
19 – WWII standard issue Army knife. Should have maker and possibly date stamped on blade. In service from 1939 until late 1940s. Replaced by all stainless knives like No.9
Hope this helps. I've sent you a PM