Just a few things I'm still looking for:
Early ornate lathe-turned H. Tibbe & Son Missouri Meerschaums that have a one- or two-section reed mouthpiece. Specifically the long No. 2, shorter No. 2 1/2 (pictured is a variant with the No. 2 flat tip instead of the usual acorn nut, and a windcap) or the No. 6 (not pictured, similar to No. 2 1/2 but has a squatter egg-shaped bowl and a shorter shank).
Corncob cigarette and/or cigar holders. These were made with both a wooden mouthpiece and with a plastic mouthpiece & metal ferrule (pictured, these are the former type on display at Missouri Meerschaum; in 1907, the shorter version was the "Dandy", the longer the "Mikado").
The MLC/Alco pipe having a transparent red Redmanol/Bakelite stem & body with a screw-in bowl and metal band & cap. I bought one on eBay, but sold it (for a lot less than I paid, and I didn't pay much) because the seller didn't disclose the screw-in bowl was missing and the metal band was just sitting in the case so it appeared to be attached(!!!) I doubt anyone would have been able to carve a replacement bowl for any price. They appear on eBay, but always out of my price range, such as the $80 one up right now-- the bands are just gold-plated (pictured).
One form of Goede Waagen/Baronite pipe, specifically this fullbent billiard shape, this bowl color, this stem color (pictured).
And this weird pipe with a wicker outer covering. I know nothing about it, save there was once one on eBay and it went far past my limit (pictured). I was unable to find any reference for the P.J.A. on the stem, which also appears to be Redmanol.
I do not own any of the pipes pictured. The MLC pipe and the corncobs are the top priorities, but I doubt I'll locate any, at least affordably.