Trinity College TM-250 Celtic Mandolin (Natural Finish) by Trinity College. $468.90. The Trinity College TM-250 Mandolin is designed for traditional Celtic music though they are used un a wide variety of other styles as well.Top quality , all solid wood construction. The traditional style body is complemented by an elegant snakehead peghead with distinctive abalone inlay in the black and white overlay. This fine instrument has a Natural Finish.. Save 41%!