Sherryl,
Some nice items. I think the DCCo hst must be post WWII because in 1941 or early 1942 the British Ordnance Board went out to all the Commonwealth asking if anyone had produced 9mm Para cartridges. Canada replied that they had never produced this caliber. The specifics are in the OB Procs. I think the earliest DCCo headstamp on 9mm P is on a blank, The Colonel who ran the Frankfort Arsenal during WWII was also a cartridge collector and I visited him when i was a young Lt which would have been about 1968 when he lived in Columbus Ohio. He had a drawer with 8 or 10 WCC steel case 9mm, which all had different case finishes but had corroded to the dates on the headstamps were unreadable, In the drawer he had an extended case blank headstamped “D.C.Co. .351 S.L.R.” that had a tag on it that said “Experimental”. He said the Canadians had sent some down during “the War”. He was kind enough to give it to me that evening, and I have never seen another.
Dominion did sell 9mmP before the war but the boxes said that it was made by Kynoch. The rounds in my Canadian boxes of the period contain K 22 rounds like the one you picture. Kynoch boxes from into the 1930s contain this round. Kynoch first made ammunition for the Dutch “Vickers” Lugers in 1920 and continued through 1923. However it appears that the 1922 production was rejected because in 1922 FN produced this ammunition for the Dutch, and the K 22 ammo appears to have been sold off in Canada and the UK for at least a decade.
The R^L round is nice and not often seen anymore. B^E also produced this round in small quantities in 1941. Note your round lacks a primer crimp that is on production ammo.
The MW 3 17 round is a nice WWI item. Lot 2 of 1917 (actually Feb 1917) was the first Schoenbeck production so your’s is an early round. They appear to have ended production in November 1915 and begun again in May 1918. No December (12 18) production is known but there are a couple of rounds known dated Jan 1919 (1 19) which are very rare.
Thanks for posting your rounds!
Cheers,
Lew