This one is a really nice example of a top quality glove with the spider web, button on the wrist strap, classic MacGregor black/red/white patch and the durable palm-crotch extension.  I believe the GCB was an acronym for GloveCustomBuilt and it retailed for $25 in 1954 and was their best glove at the time as you can see from the photo of the '54 catalog.