Stereo Cards: Sears Printing. Who knew!

Picked these up today. They are No. 32, 34, and 21 in a series about the Sears & Roebuck Co. in Chicago. They are undated. The photo of the lobby seems to tell me, from the women's fashions, that it was taken between 1900 and 1915 [update: correct. The website linked below confirms a date of appx 1905, corroborated by several cards which show more fashionable ladies). However, the large presses pictured in the press room seem rather advanced for that date. I will defer to my friends from Letpress in hopes of further information.
NOTE: to see these well, you will have to double click to biggify them!

And an update, thanks to Dr. David MacMillan on Letpress: the complete set is viewable here, with all text on the obverses. Important because a set from the Edgar Rice Burroughs collection is online, but only a few of the cards' obverse sides are included.