Stampdesc San Marino, type=special delivery-50c-unissued

desc_issuer: San Marino
desc_function: special delivery
desc_denom: 50c
desc_unissued: 1

Used by 1 overprinted stamp:
San Marino postage 9/15/1927 1.75l oc=blk on=type=special delivery-50c-unissued

Description does not match any stamp types!