Unusual rectilinear 'block' shaped aluminum mallet putter

Golfengineering ID: ucput5416
Vintage: Late 1960's
Gender-Dexterity: men's right handed
Lifecycle: used
Shaft type: Unstepped steel

Cool design with rounded sole geometry and flat top. I think these were used as advertising promo putters with various product labels on top and back. There is a hairline crack in the hosel underside that looks to be harmless unless the putter is repeatedly thrown. Fine unstepped steel shaft and very good Golf Pride Traction Action double taper flat top grip with collar in place. 34 1/2".