"LARGO" was a house brand sold by W.Ø. Larsen. There are 2 pages of examples from the Largo line featured in this 1961 W.O. Larsen export catalog:
http://www.danishpipemakers.com/pdf/wo_export_1960.pdf (see pages 18 and 19 for Largo).
"The Largo pipe is a specialty from W.O. Larsen. These pipes are made from the best quality briar and come in very handsome models with light and elegant lines. Price each $5.00."