Company item name--test set, standby s1
No other part numbers with same form, fit, and function found.
NSN 5915-01-428-4187
NSN 6645-00-596-5388
NSN 5985-00-299-3510
NSN 5945-01-487-4127
NSN 5925-01-212-0118
NSN 5950-01-157-0625
NSN 5920-01-529-6525
NSN 6145-00-925-7089
NSN 6145-01-003-0455
NSN 5925-01-519-3969
NSN 6220-01-347-6588
NSN 5925-01-522-8369