Discussed here a few years ago, albeit about more current packaging:
http://www.typophile.com/node/93388

Consensus seems to be that a proprietary face called TK Super Duper-BG2 is used, which was based on historical precedents like your label sample.

Your sample is pretty small, but even when I sought out bigger samples from the same era, I didn't get any exact digital matches.

In addition to LHF Hensler, mentioned in the post above, here are a few others that might work (and, yes, I've included some Copperplates):
http://www.myfonts.com/fonts/storm/ideal-gothic/
http://www.myfonts.com/fonts/parkinson/modesto/
http://www.linotype.com/44502/CopperplateGothic30BC-product.html
http://www.linotype.com/44498/copperplategothic30ab-font.html
http://www.myfonts.com/fonts/mti/memo/
http://www.myfonts.com/fonts/urw/american-gothic/
http://www.fontshop.com/fonts/downloads/elsnerflake/itc_symbol_medium_ot...