.30 WW2 US MG Belts, Links

[917601]

I have a few loose WW2 .30 dated tracer ( DM 43) and ball ( DEN 43) rounds, a nice Russell 1942 dated cloth belt, and a later M1 ammo can. I assembled them and then found some metal links, marked " M1 BP". Can anyone tell me who manufactured them? I am hoping the BP links are of WW2 era.

 

[917601]

I also have a pile of Izzy links, and found a pile of "WM" marked M1 links. I use those to shoot my 1919, and the .303 Bren mag case for my semi Bren. Internet says WM manufacture was Post Korean to late 70's manufacture. I am trying to assemble a WW2 ammo display and want it right. Also, I have en blocs and would like to verify the manufacturers to keep it correct. I lost my en bloc manufacture " list", anyone have one? I am adding pics of various M2 war dated bandoleers, cans, post WW2 and " shooting ammo" that I have come across.The Russian cans are full of Finn Maxim linked war dated rounds ( 1938-41), impressive at 14 ft long. The large opened wooden crate of .30 M2 was a missed auction, notice it was loaded 1 Tracer 9 Ball ( not 1 to 4), the early war load? More pics later as I go through my unorganized mess in the garage....