"N73" is a Bee-Keeper's registration number. It appears neatly-chiselled, in that curveless, lazy, runic font, on the face of every one of my Dad's self-made beehives. Awhile back, many of Dad's bees died of an infectious bee disease, and so all the nicely finger-jointed boxes had to be burned. As a nod to the pater, I put "N73"on any kind of box I make. This one: c.1999.