Further information on Bussman DMM-B-11A and ASTM 11A fuses.
As you can see by the photo the plating is duller, the fuses do appear to be OEM (the labels were identical) but possibly old stock or at least different end cap assembly with no OEM cap branding to the Bussman I removed from my meter.
I did some 4 wire resistance measurements (as opposed to multimeter ohms with test probes) with 1A of current flowing.
Results of resistance measurements of six Bussman fuses from Alibaba in mohms.
Bussman DMM-B-11A; 7.446,6.997,7.636,7.298,7.132, 7.306 Average 7.302mohm
weighed in at about 8 grams (on my kitchen scales)
ASTM HV110; 9.255mohm
weighed in at 9 grams
Little Fuse FLU-11A; 8.265mohm
I also did the 4wire resistance measurements of three mulitmeters 10A shunt including fuses (at meter terminals);
Fluke 87 with ASTM HV110 fuse 25.6mohm (fuse 36% of total)
Agilent U1233A with ASTM HV110 fuse 22.06 mohm (fuse 42% of total)
EEVBlog 121GW with Little Fuse FLU-11A 32.3mohm (fuse 25.6% of total)
Conclusion: The spread of 11A fuse resistances was close to 2mohms with the Bussman DMM-B-11A being the lowest, ASTM HV110 the highest with the Little fuse in the middle. The Bussman fuses do appear to be OEM but of unknown age.
PS When I was doing the multimeter 10A resistance measurements I noticed the fluke was "unstable" i.e. seemed to vary which the other two meters did not. Long story short; the soldering of the fuse holders was causing the problem, the fuse holders only had the fuse tabs soldered and after close to two decades the solder connections were failing. I removed and resoldered including the full base of the fuse holders this time and also replaced the input jack assembly while I was doing the repair work. Hopefully good for another couple of decades.