I am trying to identify an older type of Koehler Wheat Lamp. It uses the twist-on style charge connection like the Mk II's but has the negative contact positioned differently. The cord comes out from the side, not the top as on the MKII and MKV. It also has two separate lamps (a BM10s and a BM28) no focusing, the switch just alternates between the two....it seems similar to what is done on their currently produced E series lamps. Has anyone seen this model? If so, I am looking for the model designation and possibly any other information available. (years produced, parts lists, etc) .....they can't be too uncommon (I recently found two and a charger for them)

thanks for the help

sincerely,
rh

_________________
"If we knew what we were doing, it wouldn't be called research." -A. Einstein