http://www.thefreshloaf.com/node/28463/jewish-sour-rye-greensteins-secrets-jewish-baker
The above bread is perfect in terms of crumb and external appearance except that I'm looking for a rye that was made by a Polish bakery named Szypula's which is sadly out of business.
Back in the late 60's and early to mid 70's, my father and I would stand outside for up to an hour to get this marvelous bread straight from the trays. These were very dark but not closed grained. I know they used a fermented sour starter and it took days from start to finish.
In terms of color this is very close but otherwise, like the bread I linked to. Molasses? Maybe but after almost 40 years the exact chewy texture, taste and smell is something I don't remember precisely.
Ideas?