Made by E&A Noirit, a non-ferrous casting company in Walsall, England, this putter has a face filled with lead.  It was thought that lead, because it was such a soft metal, would provide the golfer with a softer feel when striking the ball. That may well be true, but because it was soft, lead was prone to dings and dents which could make the face uneven. 

This example has a dot-punched lead face.  The sole is stamped with the Noirit name, Noirit's location, and the weight of the club. The original shaft has a well executed St. Andrews bend. It gracefully curves directly back to the golfer when addressing the ball. 

One final point for what it's worth, the head shape of this club is clearly a precursor of the famous Wilson Designed By Palmer putter.

For more on lead face putters and E&A Noirit, see TCA2 V2 p 399.