I recently bought an alto marked William Frank Co USA in poor condition. It clearly was an Elk-Hart by Buescher stencil, with the simplified art-deco keyguard and an Elk-Hart model- and serial number. Nice sound (sort of close to my Big B alto) but very thin body and weak key material. Sold it again but forgot to save some pics.. Could be a nice horn for someone on no budget but by no means worth to have it overhauled professionally, unless you find a mint one..