Oh yeah, Badws.......new picture better on that 103. Looks like Micarta now (as is should).
Yes, in 1981 Buck removed one Micarta spacer from the guard, and the '72s had upside down stamp, so these would both be 1973 to 1980.
At least you know you have the good 440C steel for sure.
Maybe one of the sheath gurus here will be able to help a bit on that sheath.
Nice set of knives.