This kind of hammer is still available, though not particularly cheap. Do a Web search for "The Hammer Source" and you'll find most any kind imaginable. Click on "soft face hammers" on the left hand menu and on pages 8, 9 and 11 of the catalog that comes up you'll find hammers very like the one you've shown. Click on "copper hammers" and you'll get five pages of solid copper hammers up to a 20" sledge (only $399.00, but that's a deal because they want $379 for a 15# version).