NNP

In 1998, Russ Logan and John McCloskey published Federal Half Dimes 1792-1837, which expanded on the previous work by Daniel Valentine. This work entailed a significant effort, and today “LM” numbers are the standard for attributing early half dimes. NNP has recently digitized the (pre-Bust) LM plate coins from a set of photographic prints. This set includes 32 die varieties and was photographed by Tom Mulvaney.

Link to Logan-McCloskey plate coins on Newman Portal: https://nnp.wustl.edu/library/imagecollection/518109