According to my information, Baldwin engraved this set for El Salvador in 1894 when he had his own company. It was printed by the Hamilton Bank Note Company so he must have done it under contract to them.
engraved that stamp and also the 10p. (Sc#103) from the same series :Costa Rica
- 1923 - Sc# 122
Columbus soliciting aid of Isabella
Printed by American Bank Note Co.
Vignette engraved by Marcus W. Baldwin
(Issued in carmin rose in 1926 also - Sc# 123)