You are bidding on this used set of 2 vintage Correo Aereo Nicaragua 10 Dia de la Raza stamp. I think that it dates to the 1940s, and it is in good condition. It has been used and is stuck/taped onto a portion of envelope. It does have a postmark stamp on it but is otherwise in good condition. It would be a nice addition to a vintage stamp collection.
Please note that all available stamps have postmarks, but the actual postmark may vary.