The Vintage Technology Association has a unique item up for auction - a huge planar-neon Babcock SP-431 display. Do Want!
From the auction
Babcock SP-431 Sperry-style 4-digit Panaplex display, new in original foam tray. The SP-431 is one of the largest Panaplex displays ever constructed, with an impressive 2" digit height. Display measures 9"x3.25", 1" leads. This is an extremely rare display, and would be perfect for a large clock project.