Three Envelopes with uncanceled stamps

Three envelopes:
1. Self-addressed: "Miss R.A. Cook, 175 Pleasant Street, Holyoke, MA" with 2 cent uncanceled embossed stamp
2. Envelope addressed in R.A.C. hand to "Rev. C. L. Percy, Charlton, MA" with 2 cent uncanceled postage stamp
3. Blank envelope with uncanceled embossed 1 cent stamp

Approximate era
don't know
Donated by
Gertrude Cook
Item is inside of: