N Cook wrote:

from about 1986

1/ Bit larger than 1N4001 size and appearance, smaller than 1N5401 , a ring
of chevrons around marks the cathode, small script 63 then large script
B4406

2/ 1N4148 size and appearance , thick blue ring denotes the cathode end and
2 thin green rings


Are these dead? Do you have a curve tracer?

Michael